Best method to setup a basic windtunnel
 

I have the latest versions of Fluent and Gambit and need to set up a basic windtunnel analysis for a small Cessna sized aircraft. I have questions about the following:

What is the best type of surface/volume mesh for this scenario (external flow of air at about 120-300 mph).

Will 2GB of RAM be enough to perform an accurate analysis?

Will I experience any loss of accuracy in my results from being over-zealous when cleaning up to model?

How would I define my boundary conditions (I have cut the aircraft in half and have a symmetry plane)?

Does any one know of any good tutorials that show how to setup a basic windtunnel?

Thanks for all the help, Justin