You could find your life becomes allied with theirs, and that their agenda and yours merge, so you need to be clearbeforehand about what you want in life, and (more importantly) what you DON’T want.
Spirits will often push you to do things, to better yourself, so you need to know what your boundaries are. I put everything I know about that in a post, which I’ve refreshed to update it in the thread linked below.
And if you do plan to see men, or have children (possible these days with a donor if you meet certain criteria) you will need to sort that out before marrying, changing your mind later might have repercussions.