Well, first you're going to need to buy Bitcoin. I recommend LocalBitcoins because you're able to do a cash deposit in a local bank branch where the vendor banks with. Once you purchased your coins and the vendor releases them from escrow they will be in your LocalBitcoins wallet. Then you'll need to tumble them into your Silk Road account. Here is the URL for BitcoinFog, http://fogcore5n3ov3tui.onion (BitcoinFog) They charge a small fee but it's well worth it, once you have tumbled your coins into your Silk Road account you can then go ahead and place a order on the market. But remember to use PGP encryption when giving the vendor your address so only they can read it.