welcome ...and congratulations....whens the the big day?
I'd suggest the 2 of you start at the beginning of this forum and read as many of the stories and histories as you can to see how this could end up for you.
I also really suggest getting this fully flushed out before you marry and possibly have kids ... often this can be a deal breaker for people. Work it out now ...go see a counselor if you have to.
Good luck D