When he says protractor, this worked well for me for everything:
Transair TRNP 1 Radio Navigation Plotter I then scribbled out the scales I didn't use so I didn't get them mixed up!
Pen wise, the most useful I've found is the retractable sharpies. Easy to use in the cockpit one handed without the ink drying up (I got mine in Ryman's)! Chinagraph would also work. I also use retractable pencils for writing updates to my plog. Handy hint - attach them to your kneeboard with string...
Wizzwheel ("Flight Computer") wise - any of the ones designed for PPL (or CPL but they cost more) will work, but ask your instructor as they might have a favourite. Check eBay (and the link) for 2nd hand ones. I have a Pooley's CRP-1. Only need to get a Commercial one if you plan to go commercial in the future (they have a few more scales and deal with higher speeds). No need to go for fancy metal ones, and the electronic ones aren't currently allowed in UK exams. Some people like the wind arm, some don't. Personal choice - ask your instructor which he prefers.
If you go with a clipboard, make sure that you can attached it securely to your leg. I went with a transair one (basic is fine) although I managed to break a corner off it after getting one of my pencil strings caught...
Best of Luck!