a. hongfire is outdated and very irrelevant, several custom mods that cards might need from hongfire have likely been integrated into AA2Mini's pp2 mods. i dont know what you could want so i can't help you past that, don't bother with hongfire for aa2.
b. yes, those mods are the morecumpositions mod, hexapp, and several others can be found in the pp2 mod mega. the futa mod uses a static penis rather than one with bones in it, so it might not bend fully with some poses. you can always use the poser if you want to take images and adjust things.
c. the futa mod pack i've mentioned is a zip file that lets you dump the files in your aa2mini data directory, uses two example cards to help you get started and has a read me to explain further.
d. before there was a futa mod but it had to be installed and uninstalled each time and the pubic hairs on all girls would be changed. now, individual girls can have a penis thanks to the AAU Futa Mod which took the dicks from the old futa mod and made it possible to give girls dicks without having to change the games files each time.
e. they are as followed.
A00_00_01_00.xx
A00_00_01_00h.xx
A00_02_00_00_00.tga
A00_00_O_body.sviex
these won't mean anything until you learn why they're important, for example the 01 you see in the first two overrides need to be changed depending on a characters height.
also, don't use the futa cum stats launcher with aa2mini/aau, they're not compatible to my knowledge and you'll run into issues.