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All films are capable of being scanned at home, including the XP-2 you mentioned.
If you like traditional b/w grain, I'd start with Tri-X, which is an ISO400 film. You can't change the ISO with a film camera the way you do with a DSLR. You can however shoot the camera as if you had used a higher ISO, and then adjust the developing time- this is called push developing, and is only really an option if you're developing yourself.
If what you want from your color film is low grain, I'd look at something like Ektar, but I'd actually suggest starting with an ISO 400 film that is more forgiving. I'd try both Portra and Fuji 400H and see what you like.
Awesome, thanks! So far i have these, two 10 PRINTS FUJIFILM FP3000B INSTANT B&W FILM EXPIRES 04/201 for the polaroid back, Fuji Velvia RVP 100 120mm Color Slide Film #15542522
Fujifilm Fujichrome Velvia RVP 100 Color Slide Film, 1 FujiFilm FP-100C Instant Colour Film - Professional, and one more i cant recall, just to start learning!!