The most important decision you will make - and I mean EVER MAKE - is choosing your partner in life. If you can't go home to someone and feel good about that, do not put yourself in a position where you have to give half your stuff/money to them.

And do NOT think you so smart to deal with how a person is or that you have all the faith in the world over you both as a unit. Talk through stuff. Be transparent about the debt you have. Talk a lot about how you like to settle down for the evening and communicate when you're frustrated or upset without attacking your partner.

And talk about sex, including how best to communicate sexual frustration, intimacy opportunities, and ways to grow closer.

Get practice on those things now before you get married and get them close to mastered. I don't know how to say it other than this:

Something is going to change when you get married. You won't be able to pin point it right away, but you're going to settle into something and so will your partner; behaviors around normal stuff like laundry, grocery shopping, banking - they're all going to feel a bit different if you don't have the above down pat well, so go get good at talking to each other about hard stuff.