Oh man. There are LOTS of good films to use.
My two favorite files are Kodak Portra 400 (Thats the only film I’m shooting for my 365 days of Leica Project) and Ilford delta 3200 B&W (super grainy black and white film!).
If you just starting with film you can get film at most pharmacies, walgreens, rite-aid, CVS, whatever type places is near you. They also develop at most. Once you want higher quality film a developing get the ones above and look up a photo lab on yelp.