I will be increasing my yearly income fairly soon by quite a bit and it will be more than hers. If we sign papers declaring 50 50 custody and no child support today while we are both broke, can this come up to bite me? How hard is it to change the stipulations on the divorce papers in the future for her to gain child support from me? Any extra advice I should know?

I am located in Florida and we've been married for 2 years, she's publicly been with new boyfriends via facebook while we've been estranged and also I have evidence of her doing drugs and going out to bars and stuff but nothing conclusive. I might go for 75 percent custody