Child support is going to be what the guidelines state they are unless you agree to a lower amount.

And guidelines is something that I would stick with.

As for who watches the children, who has done that up to now? Who does he want to watch the kids?

Is there a disagreement on custody?

Here are some of the issues I would address:

Right of first refusal.

Extracurricular activities. Who pays what and how long the other parent has to reimburse the paying parent.

Medical (and I would have braces included in this). Again, who pays what and how the receipts are to be submitted.

Tax exemptions (make sure that it is tied into him being current on all of his financial obligations, including extracurricular activities), who gets which child if more than one, or if one, is it alternate years. If he gets one child, be sure that the net income for child support calculations reflect that.

I would also try to get a very specific parenting plan in place and how switches are handled. Such as, if he needs to switch a week-end, it is done in writing.