I take it you have little or no experience at all photographing? Else you wouldn't be asking this
Start with things that don't move, get your skills judging light and exposure developed nicely.
Landscapes work well, shoot the same scene in all kinds of light and note down the exposure details. Study the results.
Might sound boring but it works.
Do the same thing with different kinds of film.
Then go to the zoo and shoot the animals. Your first moving targets
Judge the light and go for it, you might notice that you're getting to the point where you know in advance when a certain shot is not going to work out because of the light.
Racing events are also good, if you can find one and get in a position where you can shoot.
Then go to the airport and use the knowledge you built up over time.
Once you decide on a film, use it religiously. Don't buy another film just because it is cheaper (in fact, when I use a different film it's usually a more expensive one... I'm considering switching to another film that costs twice as much, ordered 5 rolls to try it out, if I like it it will become my standard film). I now use only 2 kinds of film (not counting the very occasional black&white, which I also limit to 1 or 2 kinds), both from the same manufacturer (Fuji, the one is NPH400 (print) and the other Sensia 100 (slide) (which I might replace with Provia 100F soon)).
Start with a film like Sensia or Superia 100. Those are cheap and you want to shoot A LOT of film. burn 100 rolls or so in the first year, learn from your mistakes and successes. Create your own style, don't try to immitate the masters.
Good luck on the wonderfull path of photography. Shooting aircraft is only a part of it, an interesting part but only a part.