Getting aropund the parks will be easier if you get familiar with the layouts of the parks before you go. You can print WDW parks maps from this site, disney.com and many others or you can grab yourself a new 2004 passporter they have them in there.
As for getting around from resort to resort. I'm not certain I understand your question. If you are using the reosrt buses, you take your resort bus to the closest park..like MGM, and trasfer buses to the resort you are going to. With your rental, you would have to look at the maps of WDW. I'm not certain, but it doesn't look to hard to find each one.