Welcome LLL. I am from Michigan too. I know that with Priceline, basically you have to do your homework ahead of time to know what airfare is before you go in and bid. They say you should start low and go in and change your itinerary slightly, so you can go back in and bid again. There is also a link to get in and use $25 bonus money per ticket (you must go through that link to use it). That link as well as much more info. is availble on that website (that was mentioned above). **** If you do a search with the words "priceline and Expedia" it will show you that website. It is called "Informed Priceline/Expedia bidding" or something like that.
When are you going to WDW? We are going next February and We got our tickets through Priceline.com - We got United Airlines $160 (minus $25 bonus money) = $135 per ticket round trip with 1 stop in Chicago). (and there are 4 of us too). Good Luck