I'd be creating a page right at the top that explains exactly what the site is for, and how to use it. Possibly also some examples of the rates that people will trade for. Help out those beginners.
And something like a feedback forum too. Also out of curiosity, what are your plans in regard to making money from this? Will you be one of the people doing the majority of transfers?
Good luck with this - I'd personally go another route if I was doing this(some sort of escrow service) - hope it doesn't come a site ripe for scammers
