What do your credit reports show? What are the longest delinquent accounts with the largest balances? If you can't pay it all off right away, contact your creditors one by one and make payment plans that you can afford. If there are accounts you do not recognize, dispute them with the credit bureaus.
Once you have made payment plans with your creditors, stick to them. Speaking from experience, I will tell you that it takes time to rebuild your credit. Don't get frustrated. Just keep plugging away. Keep making your payments, develop a budget, stick to it, and most importantly, put your kids first. Teach them financial responsibility as you are learning it yourself.
If you truly find that your debt is not manageable, do consider declaring bankruptcy. Yes, it will hurt your credit - but it's already in the toilet. Don't look at this option as some kind of moral defeat - in fact, stop looking at money as moral positive or negative entirely. Like everything else, bankruptcy is just a financial tool that may allow you to shed most of your debt and start fresh. Yes, it should be the last option, but it IS an option.
