The info is out there, I've posted it before myself, on what to buy/use for the kodak C-41 chems. the Kodak stuff is WAY cheaper per roll, and better quality, I think.

Dev needs starter, bleach and fix don't need starter.
Bleach is expensive and expensive to ship, but can be re-used multiple times.
I use fix and dev one-shot, because I can, and because it's fairly cheap to do so.
final rinse is dirt cheap, also use that one shot.

I usually buy the 5-gal quantities of stuff, and mix 5L at a time, which will do 48 rolls of 35mm or 120, one-shot, in my processor. It would also probably do at least 48 sheets of 4x5 film, if not more.