As far as records in the darkroom go, I keep pertinent printing info on the back of a proof print including exposure info, paper used, developer/dilution/time and info on toning, bleaching etc. I will either use a grease pencil and make notations on the print about dodoging, burning, filtration etc. Sometimes a seperate paper clipped to the print contains additional info.

In a notebook I keep a list of prints made, numbers and sizes of each and date neg exposed and date of first printing.

One thing I did in my darkroom was to install lamp on a pivioting and telescoping arm over my sink and trays. I have about 8' of area so the arm allows me to have a consistent light source over any area of the sink.