A good set of metric tools(sockets,wrenches, metric allen wrenches) 1/4" and 3/8" drive ratchets and extensions, place to work on your bike,a comfortable place to sit as bending over is hard on the back and a well lit area at night are just some basic things to look for.
A oil change collection pan, some blue Loctite 242 for fasteners that want to vibrate loose, a good multi-meter for electrical troubleshooting, and some electrical contact cleaner(Not WD-40! don't ask me how I know)
Shop manuals can be purchased through dealerships so give BTK a try first. If no luck try at
Repair Manual Catalog Online - RepairManual.com or at
onlinefreebooks.net
A good fuel additive can be purchased at Wal-Mart for under $9 it's called seafoam
Sea Foam for info.
Rebuilt starters might be available at
www.ricksmotorsportselectrics.com [1],
www.rmststor.com,
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Custom Rewind -- High Quility Remanufactured Motorsports Electronics, Rotors, Stators, Ignition Systems