John,
I don't have much to offer, but I feel bad that nobody else has chimed in.
> I have the avr7300 my first question is, how do you use that ez set with the mic. <
My best suggestion is to ask the dealer you bought the receiver from. Hopefully they'll have one set up and be able to walk you through the process.
> my main fronts have there own amps. should these be set at large? <
Whether they're self-powered active speakers or not, I'd think you should still set them to small.
--Ethan