回复：should she pay $1K support if i only earn $2K?

if you just want a fair child support, you can just let your state attorney general to take care of your case until your kids turn 18. It is free service. In my opinion, they are excellent. to apply, click this link
1. child support enforcement
http://www.acf.hhs.gov/programs/cse/extinf.html
2. Child Support Calculators
http://www.divorcelawinfo.com/calculators.htm

If you want more, that is another story....