Generally speaking,
1) Get a DBA (Doing Business As) certificate
2) Get a sales tax license.
3) Open a business checking account.
Don't expect to get awesome reseller prices on hardware. It just doesn't happen, unless you buy volume. Newegg is as low as anywhere out there.
Check out
www.ascii.com, they can hook you up with some reseller companies and put you in touch with other folks in the reseller biz.
Good luck
Grandma