You need a good camera, adjustable lights, studio (just floor, ceiling & two walls completely white OR different sized black boards e.t.c.), different backgrounds, maybe a green screen if you want to change different backgrounds after you take the photo, things like chairs/cushions/sofas/stools/tables/and unique objects for subjects to pose on, maybe a variety of different cameras that do different things, many memory cards, a computer/laptop (doesn't matter what kind as long as it has a lot of space for photos, is fast and has all the different photo editing software's and things), printer (you'd just have to ask the guy in the shop what the best photo-printing printer is) and maybe different objects like roses, books, rubber ducky's (lol) or even empty photo frames (to use as template later) for subjects to hold.....
I think the best thing to do would be to hang out at a photo studio for the day. Write down lots of questions you'd like answered & either bring a voice recorder or a video camera so you can re-play the answers. Video camera would be better because video the different things they have in the studio, see how they work and find out their names, why they're important, what they do e.t.c.
Hope this helped!!!!!!!!!!!!

xxx