Understand your credit report. The report is made of of your credit history and other financial information. It's used to create your credit score, which is a number. The annual free credit reports won't give you a score, they'll just provide you the information that goes into calculating the score. This is the information you'll get with your credit report:
This is easier said than done, but reducing the amount that you owe is going to be a far more satisfying achievement than improving your credit score. The first thing you need to do is stop using your credit cards. Use your credit report to make a list of all of your accounts and then go online or check recent statements to determine how much you owe on each account and what interest rate they are charging you. Come up with a payment plan that puts most of your available budget for debt payments towards the highest interest cards first, while maintaining minimum payments on your other accounts.