Thank you very much mate As you've already said in question - Keep it simple.. Jumping from gaming websites to business ones isn't easy at all. I know that 'cause I started by making gaming designs, too.. You just have to turn off those massive effects which are used on modern gaming portals and keep an eye for details, nice flow and fact that site should really be easy to navigate in and use.
Design shouldn't be on first place as it's used to be at gamings. Your goal on business websites is to put content into good looking case, but not at cost of reduced usability.