About your website design (you might know already):
Make sure you show the user that he can buy games on your website, show this on the homepage, with obvious links to the shop, demo versions and gallery/screenshots. Very important to have a screenshots section.

Make your homepage interesting to see and read, and don't exaggerate . People judge your site on it's homepage in less than 5 seconds. If they like it, they'll read on, if they don't, they're gone again. I'd make a colourful yet serious looking site. Post one or few small pictures on the homepage next to your game advertisement that shows a good impression of the game. Give a nice describtion and you should do quite well already I think .


I hope you'll get some replies about the business part, I'm curious too about it .
Good luck!