ok, first you need a camera, although i see that you've identified that already. I'll bet if you don't want to start off serious and spend alot of money you can use a compact camera with a zoom lens and take some pictures panning with the aircraft.
Then you can move on and buy a Second hand SLR and a lens (preferrebly one with 200mm+ focal length) and maybe a film/slide scanner..
Then you need to learn the basics, always have the sun behind your back for best results, try and avoid taking photographs on cloudy days, pan with the aircraft (follow it with the viewfinder), try and get it to fill most of the frame.
Then read the manual to learn about aperture, light metering and shutter speed. This knowledge will help you alot.