o and another question is buffalo/niagra int'l airport on here i live by it ad i see plane on final fly oer my house everyday. and is niagra falls airforce base there. home too (forgot sqaudron numbers) of a refuling sqaud. so i seee kc130's and 135's alot
As far as I know it is all here. There are 10's of thousands of airports in FS, so it should be there. As for KC-135, just look through the downloads section you might just find one.
There is no easy answers for your first question. You just have to load it fly it, download what you like by searching for it, and tweak it.

It is not easy, and takes a lot of time to build up your hangar, but well worth it. The time that you put into FS, you will get double if not triple in return (talking about the enjoymen/fun factor)

. I have been doing this since FS 5, and not one regret....
