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The only pointers I can give, are that it's very difficult to persuade the larger distributors to deal with you, unless you have a 'bricks-and-mortar' store. Distros are worries that internet retailers will undercut their longer-established customers, and create bad feeling amongst them.
If I was to try to start trading again, my first port of call would be http://unionofpedallers.cc/ as they appear to be supporting the little guy, but I can't vouch for whether or not they'd deal with a non-physical shop. Always worth a try though!
I believe @finger_jockey can give you pointers.
Ceeway do sell stuff in bulk:
http://www.framebuilding.com/
I have purchased a box of 100x brake cables for £35 posted about 18 months ago, still not half way through...
(and come to pick up your bike!)