two things happen financially when a couple divorces; equitable division, and support and maintenance.

equitable division is supposed to be presumably 50/50, but the "equitable" part lets the court do whatever the fuck it wants. the court can consider which party is at fault if it's the man, or ignore fault if the woman was a crazy whore. they can consider which spouse has the greater income potential and whether the other spouse helped the first to advance towards that potential, if the breadwinner is the man, or it can consider that the lower earning spouse doesn't deserve anything if the breadwinner is the woman. it can consider the difficulty in splitting up an asset if the woman owns land or collectible items or ignore that difficulty and make a man sell off his business assets to buy his ex wife's half of his stuff. any of these considerations will be used liberally to give the woman more than half of the property earned by the two spouses during the marriage. that's how equity works when one party is always a man and the other always a woman.

support and maintenance is based on need and ability to pay. sometimes it's for life, and other times it's for a few years to give the other spouse a chance to get on their feet. in a marriage in which the parties had explicitly agreed to one spouse not working and where the other spouse was at fault for the divorce this would actually seem pretty reasonable. however, alimony is often awarded to women who are at fault or who filed for divorce without the man having committed any fault, as well as to "strong, independent women" who "don't need a man".

these outcomes can theoretically be modified by prenuptial agreement. however, such agreements can be thrown out for very little cause. the more you try to restrict the court, the more likely it will just set aside enough of the agreement to do whatever it was going to do anyway. (even though you're restricting it to 50/50 like it was supposed to be doing in the first place)

child custody also becomes relevant upon divorce as well, and with it, child support. upon divorce it works about the same as how it works upon birth of a child to an unmarried woman except, 1) the man always knows the divorce is happening and 2) the husband at time of birth is the presumed father of the child. this is a separate issue and while the shitstorm of state enforce cuckoldry going on all over western civilization is an important thing to understand, it isn't directly raised by your question. in any event, child support and custody and visitation are 100% outside of any prenuptial agreement.

the more important issue for men to understand about marriage is how much money women spend on themselves. it is un-fucking-believable the shit that the average woman thinks she needs to survive. a man will buy a smart phone and a basic plan. a woman has to have the very latest iPhone. a man goes to a barber every three weeks or so and gets all his hair chopped off. a woman goes in weekly and hires the hairdresser for a quarter of a day. a man has a week worth of attire appropriate to whatever job he does, a few outfits of dress clothes, and a few of casual. a woman needs something different to wear every single time she might see the same person twice.

none of the types of spending women are inclined to do are used against 'her half' in determining equitable division or support and maintenance. meanwhile all of your guns, electronics, tools, vehicles, etc. will be counted as marital property. and this cunt, who spent your money painting fake cheekbones on herself and dying her hair and dressing herself like a whore in hopes of attracting a replacement for you, will have the balls to use the frivolous nature of your expenditures against you in court. bizarrely, nobody will laugh at her.

whatever your expectations are of yours and your future wife's earnings and expenses, they are probably wrong. no matter what job she has, she can probably spend everything she makes on herself along with a portion of what you make, and she will not feel the least bit bad about it.