You need a few shows under your belt at the least. No one will spend money on an unproven investment.
Your best bet is to try for some free supps.
To do that, go into the supplement section and apply to opportunities there.
I've asked this before, and have tried on my own.
A snowball has a better chance lasting in hell then we do getting a sponsorship without ever having stepped onstage and shown/proven the goods.
Good luck.