you can use any 35 mm film. cheapest i have found was fuji 400 but you may be able to find cheaper. I personally like kodak film better i think. my pix have just turned out better for my personal pref. and to be honest it’s not that much more expensive i don’t think. hope this helped!
no not a biggie, i actually love this camera, you don’t fly have to do much which is nice for film, it is fully automatic except for adjusting the ASA. and for film i think the cheapest i have bought is fujifilm 400 (i think)
finally if you want to start, just start. put in a roll and start snapping.