How, what will protect him from becoming an oldi?

Hello. Have a “new” car. Now I would like to protect it in terms of rust. Especially on the underbody, transverse handlebars, axle carriers, STAbis etc.. Since these always very much like to start gammeln after a short time. Also my brake drum (wheel mount) which is still so nice silver against rust, smudge… protect! How , with what best ? ? ? Would you like to do it all by yourself. OR ,should be affordable Are there separate spraywax or something like that in cans ? Thanks Marc