cost control are an important issue, so you paying the utilities, but let's say he wants it 80 degrees all winter and 70 degrees all summer, your electric/gas bill could be more than a fair rent
household common fund to pay the bills except the house payment, you pay set rent based on what you are paying now
all other cost split down the middle -- this requires agreement on lots of things not self motives, like temp of the house winter/summer. This a costly one and must have a common agreement.
this house fund does not pay for personal items and gifts etc ,, you and he will always have your's and his stuff, you will not be wearing his underwear so for example those are his and yours. Simple fact women spend a lot more on personal items than men. many house wives tend to think makeup is a household item or christmas decorations are household items BUT they are not, necessities are things you have no choice about ,, only those are covered by the common fund.
FYI being married and living together are the same thing , do not think once your are married you need to have all in one accounts and all the funds are common spending needs
you are wise to plan ahead very good for you
and do not listen to the women telling you not to keep split cost (his money is your money concept in marriage) ., they often are the divorced ones ands misery loves company they want you to fail as they are
you will find plenty to disagree about no need to make money one of them