As a player who started onGerman air and played an year without spending a single cent. I give you these advices.
109 are player friendly. Learn how to fly them with YT. 190 are different so I'd suggest it as the second line but of you want some for CAS pick the attackeror bomber line.
German props are extremely good in the beginning but as the tree progress. The competition catches up and right in the end they become not so dominating.
Don't have high hopes for German Jets. They have one of the worst jets in the game Simply because of BR compressions and Germany getting exported versions of the original jets. If you want jets. Pick something like USA OR USSR.
Learn tactics and manuvers. They can teach you the skill you need to survive in the not so friendly game.
DO NOT GET ADDICTED TO THE GRIND. IT WILL EAT YOU UP. because it made that way. Frustration you're gonna feel is deliberately places there because Gaijin wants
• If you are a free player, They want you to buy a premium vehicle • If you have a premium vehicle, They want you to buy the premium time • If you have both, They want you to keep buying them forever like a subscription.
If you are frustrated and thinking about doing one of the above, It is their CUNT BUSINESS of PRACTICE OF MAKING MONEY OUT OF PEOPLE'S FRUSTRATION working.
You either can give up and go along with it or realize the truth and resist it.
Just treat the game as a something you do only rarely. Do not get addicted.