>Is there like a short intro to this?
I would recomend going to a field and rent a gun before doing anything
>Most seem to run on batteries which sounds kinda weak.
Well, most airsoft guns are electrical, you can also buy gas guns, but they cost more and I would not recoment, besides, airsoft batteries last enough you won't have a problem with running out of battery in the field
>What kind of gun can I get that is decent and cheap in a country without freedom? germany
and for your first gun, as >>1545
said a cyma ak like the CYMA CM028 is good and cheap.