Looks like a well thought out plan. We're not used to these kind of posts here, you must have done some searches or something before creating this thread .

I would look at the ChongQing area as a place to start. You should have good luck with the licensing, bike purchasing and registration there.

If you have a valid visa and motorcycle, you can go pretty much anywhere you want in China without a guide. Just forget about Tibet and some sensitive areas in Xinjiang.

Cheers!
ChinaV