Moving in with him?

We talk about moving in with each other a lot but it wouldn't be happening for another 2+ years bevause I am 16 and he's 18. He graduated and I have 2 more years left ( in grade 11 ) but we are very serious and we have talked about one day getting married ( he brought it up ) and I know it's awhile away but what is there to expect when moving in with your boyfriend?