You can read your states statutes on divorce. My state has a worksheet that calculates child support. I assume your state does as well. Might be a good place to start to understand approximately how much $ each month would be reasonable.
"What is best for my kids is best for me" Amor Fati Link to quotes: https://www.divorcebusting.com/forums/ubbthreads.php?ubb=showflat&Number=2879712