First, you want to find and apply for at least one card that offers interest free balance transfers for anywhere from 6 months to one year. Sometimes you can find one that gives you a longer time for this promotion.
Then, after you have compiled your plan of attack on your debt (make sure you have a written plan), start with transferring from your highest interest rate company to this new one. You may have more than one which is charging you a high rate, so include as many as possible if your credit limit allows.
During this time where you are charged no interest, pay as much as you possibly can on your balance each month in order to bring that balance down, or wipe it out completely.
If you still have a remaining balance at the end of the promotional interest free time, find and apply for another 0% on Balance Transfers
Before you know it you'll find yourself debt free.