You could always start easy. Go around door to door with a sponsor sheet saying what you are doing and how much you need to raise and say you were wondering if they'll sponsor you. Also use a ctachphrase--"Every little helps" ? Then tyr car washes, bag packing etc. Rind companies and see if they'll sponsor you, say you'll do the rally in Gumball fashion with your car covered with sponsor stickers. If you have a little brother or ssiter, make it look like they are homeles, see how much money they can make on the street.