I'm confused about your wording. How were you "trying" to be straight?
As for your questions, in principle they are as different as any straight/bisexual/pansexual/transexual/ etc. relationship. Putting aside comments like, "it depends on the person", generally speaking the chemistry and hormonal productions in men and women do mean that a heterosexual relationship will probably operate in a different way than homosexual relationships. To detail these basic differences between the sexes here would be long-winded, probably fairly inaccurate, and targets for many feminists and the nature/nurture debate.
What do you want? What does he want? Where do both of you see yourselves in 20 years if long-term is what both of you are looking for? Do you both want children, and would you have problems with alternative conception methods if adoption wasn't your thing? What the power structure in your relationship so far? Does he do things that annoy you to no end and there would be no compromise for? (Notice I said thing
s, and even then they would have to be big things.) Are your jobs and interests compatible in as far as they benefit your similar long/short-term goals? Do you both simply want sex with the same gender? What kinds of problems would a homosexual relationship pose for your other friendly and familial relationships? And so forth...
Note that most of these questions are exactly what you would ask of any romantic partner. Have fun learning this stuff about the other person.
