Firstly, the very best of luck to you. I'm nearly through my 14 exams on a part-time, distance learning basis, and let me tell you - you're in for a hell of a time!!
Off the top of my head, you'll need...
Course manuals (being supplied by the school I presume and hope!)
Jeppesen student manual
Basic scientific calculator (check will your school as to the things it can't have)
CRP-5 (your basic whizz wheel you used for PPL isn't exact enough)
Chart plotting gear (ruler, dividers, protractor (sp) - that kind of thing)
CAP manuals (now available for download from the CAA website)
Red Bull -lots and lots and lots of it.
Notepaper - see Red Bull
I'm sure there is more, but its late and after a session today on Op. Procedures, my brain hurts. In fact, add paracetemol to the list....
Regards,
Blueskyrich