Having these both would help making goldcoin popular easily. This is my suggesstion to make a official online wallet or accepting third parties to create online wallets and work with them.
And a Marketplace to buy and sell gold coins, I know that gold coins now can't be bought directly but we should buy bitcoins from money and then buy gold coins, Which is not a very good thing. I would suggest making a standalone marketplace to accept cash and offer gold coins. I can help in this as i am a bit good php coder. And can do this thingy but needed some help too.
Please reply.
-Thanks-
Skillerz LTD.