I'm new, but have read on the forums that the best way to establish a reputation is to sell some goods. I will sell one 1964 or before silver quarter (junk silver) for 0.55 BTC. Price includes shipping/handling and insurance.
If interested, either PM me or post below. (We can work out the details in PM).
*Edited to take the price down from .55 to .50 BTC*
You might also try adding it to the order book on the #bitcoin-otc marketplace. That is useful for also building up a trust history on the #bitcoin-otc Web of Trust (WoT), useful regardless of where you trade -- here on the forum, on BitMit, etc.