Regarding developer solution volume, a good rule of thumb for starters in a standard 8"x10" tray is 1-1.2 liters. I find 1 liter works quite well (for the stop bath and fixer as well). It keeps the paper well covered, and also allows for fairly vigourous agitation without spilling all over the place. Agitation should be continuous throughout the development time. Same for stop bath and fixer.
Originally Posted by cepwin
Most safelights for typical enlarging papers are either red or amber.