You have indicated that you declared bankruptcy once, so a secured credit card is probably what you need. To get a secured credit card, you will need to pay a security deposit as collateral, usually starting from $200. Except security deposit, secured credit cards act in the same way as unsecured, general, credit cards.
The most important credit card feature for you to consider is credit reporting. Secured credit cards allow you to improve your credit history and your credit score by reporting your credit performance to major credit bureaus. But before you shop for a credit card, check on your credit history. Look for errors and if you find any, dispute them.