Hey, you need a "Gewerbeschein" for camming.
You will have to pay "Einkommenssteuer" and over a certain amount also "Gewerbesteuer".
From what i learned, you won't have to pay vat in most cases. (Most camsites charge vat to european customers and wont pay that out to you. Also your earnings are outside of the EU. It is called "reverse charge Verfahren" or something like that)
Not sure if you are employed or a student rn, but you will also have to pay your own health insurance and with the "Gewerbeschein" comes a membership in the Industrie und Handelskammer, which is like 50 bucks per year depending on how much you make.
This coming from a EU citizen,not sure how your tax responsibility is, if you are not.