As someone who's AFAB I have no clue...I'd say, for starters, just your identity first, deciding that. That's all you need for yourself. Secondly, if you want to take any steps with changes in style or clothing or any of that, that can be gender affirming. However, Idk about that because I don't really care about gender norms... Hair changes, clothes changes, pins, drawing persona more fem, etc etc. Oh, and maybe just any other things that might help with gender affirming... hm. Uhmm I have a cousin who's trans, I can ask her for advice?