L.,
What I have to say may sound a bit harsh, so please believe me when I say that my intentions are not geared in that mannor. I have a lot of experience with this issue, so my words come from a very informed point of view.
Whith that said...
First of all, you need to stop thinking about child support as a way of "getting back at him." Remind yourself that you did not create these children alone, therefor you in no way should have to financially support them alone. File for child support and FULL CUSTODY of your children. This is only for the purpose of protecting yourself and your children. In the state of Ohio, both parents listed on the births certificate have equal rights in the courts eyes until there is deffinate custody established. That means that unless you have it on record and signed from a judge, he can come and take your children and keep them from you and there is nothing you can do about it. I have gone through this first hand, and believe me when I tell you that this is 100% true.
Second of all, you have no way to ever ensure that he will be there in the emotional sense for your kids. Asking that he be there to buy them food and clothes and whatever is only a temporary fix. Be honest with yourself. Was he ever really there for you when you lived together? From the sounds of it, I am thinking no. To be honest with you he sounds like a loser. Do you really want someone like that having a major role in the job of raising your children? The best predictor of future behavior is past behavior.
I would suggest very strongly that you consider what is truely best for your family (you and your kids). If this realtionship is not going to work, you can not make it. And please for the love of Pete...get the ball rolling in court because it takes FOREVER to get anything established in this state.
Good luck and if you want to contact me personally, I willgladly share my entire story with you. My email is ____@____.com
J.