Regarding the child support, it's set by the state based on his income so get what the girls deserve and don't even think about feeling guilty about that. It's for them.
In your yellow pages, you should be able to find legal aid under the lawyers section. It should be alphabetical.
Let me know if you can't find it and I'll get you a number. I'll need to know what city or county you live in though.
See Emily, when you educate yourself, the legal part of all this at least, is not so scary.
