In my oppinion sponsers are all about who you know, not so much what you know (or in this case how good you are).
I dont know of many 'drifters' that just cruise around getting free stuff. A couple of my mates are sponswered and i know all of them are still forking out plenty of money to go drifting every 2nd week.
I think before you go 'looking' for sponsers, i would want to be at a pretty high standard, asin being out drifting atleast once a month, doing well in these events, making top 16s every time that sort of thing.
Also what i have found is goto the same places to buy tyres/parts, thats what i do and now i have a good relationship with a couple of shops, got little stickers on my car for them and they jsut kind of help out, dont give me things, but do deals on prices that sort of thing.