At the same time, it s a big responsibility. If you don't use it carefully, you may owe more than you can repay, damage your credit rating, and create credit problems for yourself that can be difficult to fix.

Chances are your mail is full of offers from credit card issuers. How do you know if the time is right for a credit card? Here is some important information that may help you determine whether you're ready for plastic, what to look for when you select a company to do business with, and how to use your credit card responsibly.

Before you submit a credit application, get a copy of your credit report to make sure it's accurate. Contact the credit bureaus listed in the telephone directory under "credit" or "credit rating and reporting." Because more than one credit bureau may have a file on you, call each until you locate all the agencies maintaining your file. The three major national credit bureaus are:

Anyone who takes action against you in response to a report supplied by a credit reporting agency  such as denying your application for credit  must give you the name, address and telephone number of the credit bureau that provided the report.

Second, consider a secured credit card. It requires that you open and maintain a bank account or other asset account at a financial institution as security for your line of credit. Your credit line will be a percentage of your deposit, typically from 50 to 100 percent. Application and processing fees are not uncommon for secured credit cards. In addition, secured credit cards usually carry higher interest rates than traditional nonsecured cards.

Third, consider asking someone with an established credit history  perhaps a relative  to co-sign the account if you don't qualify for credit on your own. The co-signer promises to pay your debts if you don't. You'll want to repay any debt promptly so you can build a credit history and apply for credit in the future on your own.

A positive credit history is an asset, not only when you apply for a credit card, but also when you apply for a job or insurance, or when you want to finance a car or a home.

If you've been denied credit because of information supplied by a credit bureau, federal law requires the creditor to give you the name, address and telephone number of the bureau that supplied the information. If you contact that bureau within 60 days of receiving the denial, you are entitled to a free copy of your report. If your file contains accurate negative information, only time and good credit habits will restore your credit-worthiness. If you find an error in your report, you are entitled to have it investigated by the credit bureau and corrected at no charge.

You should dispute any inaccuracy in your report with the credit bureau and also with the company that furnished the information to the credit bureau.

ANNUAL PERCENTAGE RATE (APR)
The APR is a measure of the cost of credit, expressed as a yearly interest rate. Check out the "periodic rate," too. That's the rate the issuer applies to your outstanding balance to figure the finance charge for each billing period. For example, if you have an outstanding balance of $2,000, with 18.5% interest and a low minimum monthly payment, it would take over 11 years to pay off the debt and cost you an additional $1,934 just for interest, which almost doubles the total cost of your original purchase.

GRACE PERIOD
This is the time between the date of a purchase and the date interest starts being charged on that purchase. If your card has a standard grace period you have an opportunity to avoid finance charges by paying your current balance in full. Some issuers allow a grace period for new purchases even if you do not pay your balance in full every month. If there is no grace period, the issuer imposes a finance charge from the date you use your card or from the date each transaction is posted to your account.

ANNUAL FEES
Many credit card issuers charge an annual fee for granting you credit, typically $15 to $55. Some issuers charge no annual fee.

TRANSACTION FEES AND OTHER CHARGES
Some issuers charge a fee if you use the card to get a cash advance, if you fail to make a payment on time, or if you exceed your credit limit. Some may charge a flat fee every month whether you use the card or not.

CUSTOMER SERVICE
Many issuers have 24-hour toll-free telephone numbers.

OTHER BENEFITS
Issuers may offer additional benefits, some with a cost, such as: insurance, credit card protection, discounts, rebates, and special merchandise offers.

ERRORS ON YOUR BILL
You must notify the card issuer in writing within 60 days after the first bill containing the error was mailed to you. In your letter, include: your name; account number; the type, date, and amount of the error; and the reason why you believe the bill contains an error. In return, the card issuer must investigate the problem and either correct the error or explain to you why the bill is correct. This must occur within two billing cycles and not later than 90 days after the issuer receives your billing error notice. You do not have to pay the amount in question during the investigation.

UNAUTHORIZED CHARGES
If your credit card is used without your authorization, you can be held liable for up to $50 per card. If you report the loss of a card before it is used, the card issuer cannot hold you responsible for any unauthorized charges. If a thief uses your card before you report it missing, the most you will owe for unauthorized charges is $50. You should be prompt in reporting the loss or theft of your card to limit your liability.

REVOLVING AGREEMENT
A consumer pays in full each month or chooses to make a partial payment based on the outstanding balance. Department stores, gas and oil companies, and banks typically issue credit cards based on a revolving credit plan.

CHARGE AGREEMENT
A consumer promises to pay the full balance each month, so the borrower does not have to pay interest charges. Charge cards, not credit cards, and charge accounts with local businesses often require repayment on this basis.

INSTALLMENT AGREEMENT
A consumer signs a contract to repay a fixed amount of credit in equal payments over a specific period of time. Automobiles, furniture, and major appliances often are financed this way. Personal loans usually are paid back in installments, too.

The Consumer Information Center (CIC) publishes the Consumer Information Catalog which lists more than 200 booklets on a wide variety of subjects, including credit. Write Catalog, Consumer Information Center, Pueblo, CO 81009. Or call them at (719) 948-4000.

American Express Company offers free consumer booklets on a variety of credit subjects. To order, contact: American Express Company, PO Box 4635, Trenton, NJ 08650-9874. For information about students and credit, you can visit The Money Pit at American Express University.