Nice Kal, I picked up the same AP kit! There's probably a master list of stuff you need somewhere here on FISD (maybe someone more senior on the forum will chime in), but I'll list off some stuff I can think of off the top of my head.
While you wait for your kit, you might as well order in some TK boots, helmet padding or hard hat liner, S-Trim for the helmet, correct mic tips, 3 tubes of E6000 glue, make sure you've got a sharpe knife, a long straight edge for cutting, an E11 blaster (kit), some white industrial velcro, helmet fan kit, voice amplifier kit, flexible hand guards, original strapping kit or a bunch of snaps, neck seal, white belt, black undersuit, inner drop boxes and some small hobby paint cans of the colors you'll need.
Don't forget sandpaper and patience!