Volume. Fill the cannister.
Processing time. Tank time as per your film's data sheet.
How many. One (curl film slightly and rest against the inner edge of the tank with the emulsion side facing in. This will keep the neg from bouncing around during agitation and maybe damaging it).
Dry. I hang mine on a line of some sort with wooden clothespins.
And don't forget to put the center post in the tank!!!
Just because you don't have reels doesn't mean you can leave it out like someone I know tried. (No names here.)
The center post is the light trap, not a thingy to put the reels on.