This book will focus on the rights each spouse has under certain laws, situations, and circumstances, and how the division of the property will be decided by the court or through negotiation.
"All I get 500/week to manage kid's activities, babysitter, food, pets , ect."
So you get about $2,000 a month from him to basically feed your kids and pay for activities and that's not enough? Why would you need to pay a babysitter if you are a stay at home mom? I'm assuming he makes your house payment and pays for your other day to day living expenses (utilities, cars, etc.) so how can that money not be enough? And as far as your other post about your 2 kids from another man, your current husband is not and would be under no obligation to support them if you two separate. Why do you not get child support from their father? That is who should be helping you support them. It is doubtful you'd get $500/week in CS and/or alimony if you left him. You'd only get CS for the two kids that are his, not all 4, and it's not very likely you'd get that much money per week, since it would be based on only two kids, and it's not likely you'd get anything but temporary alimony since you've not been married very long. You'll eventually have to find a way to support yourself.
I'm not saying your husband isn't a jerk for this whole post-nup or I'll divorce you stuff, but you have to have realistic expectations of what could happen.