Really this is what you need to do. Go out to bars or whatever (not dance clubs) and start talking shit about being a rapper. Because every white kid and his brother wants to rap you'll find plenty of challengers. Challenge them to a freestyle battle and try your best to put money on the table so that you can win something. Then after you win be really obnoxious and talk a lot of shit and make sure your reputation grows. ("Dude have you heard about Just Silver, he was killing people downtown last night") then rinse and repeat. After you get a little popular start putting stuff online and start telling people to go check your shit out and hope they do.
Good luck on your quest.