Wow I need to have your job. I agree though about getting good quality stuff.
Some of the things I can think of:
-A high tork starter Hangar 9 and Hobbico are some good ones
-A glow starter " "
-fuel probably 15% 4 stroke
-screwdriver with different end attachments
-tape scotch and duct ya never know
-extra glow plugs probably O.S. F
-glow plug wrench
-fuel pump electric or hand
-spare nuts and bolts
-glue all sorts
-a good set of allen wrenches
-hobby knife with spare SHARP blades


This is enough to get you in the air and I can't think of any other goodies but I am sure plenty of others will. My biggest piece of advise to you is to get an experienced person to help you, that plane is really not a true trainer plane. I hope this helps some and I hope you enjoy it.