My Father in law was stationed in Germany and my wife spent most of her childhood there. My uncle was also stationed in Germany. Because we are Canadian, none of them lived in Landstuhl, but still some basics.
Get up to date on all your shots etc. You can get it done over there, but you will be getting acclimatised, so it will be less stressful to do it here.
You can take your puters and get a volt converter. But do you have a laptop or desktop - if you don't have a laptop, get one. You don't want to spend the money and risk shipping a big ole desktop.
Banking - check and see if the branch you deal with now has branches in or around Landstuhl. The big banks will, the smaller regional ones won't.
Places to visit - well the distances around Europe are not so vast, you can visit the whole continent. Can't miss Ocktoberfest in Munich, if you like beer and polka. Austria is scenic. Northern Italy isn't that far either.
Driving - depends on whether you need to. Most countries have some sort of International drivers license that will do for a while, but eventually you would have to get licensed in Germany, and they are very strict about licensing. Gas is very expensive. If you can get by on transit, and sightsee by plane or rail, you might be better off in the end. But of course, if you do get to drive there are no speed limits on the autobahn.
I am presuming your contractor is working for the USAF? Check and see what access you would have as a civilian contrator to base facilities.
Good luck.
James