First I would check the payday loan laws in your state. Then I would contact advance america soon before they take you to court. advance is probably the only one that is licensed in your state. They probably will make payment arrangements with you.
For the bounced checks, if you remember who you wrote them out to, I would call them and try and make good on those checks. The places that you wrote those checks out to can turn them over to a CA and then it will go on your credit record but they can also turn the checks over to the DA and the DA can take you to court.
with the internet loans, if they haven't contacted you yet, your lucky. They will call you at home and at your job when you default. It is a nasty cycle with them. But don't believe what they tell you over the phone, unless they are licensed in your state. You may want to contact them after you get the other things taken care of first.
Good luck and it's great to see that you want to take care of these. It will take some time but in the end you will feel better when you get them paid in full.