FPV drones Germany

Hello, can someone describe a realistic legislative situation with FPV drones in Germany? Should I get any license to fly, how strict is the monitoring of all this stuff? Let‘s assume that in the future I want to fly not only in my yard. How Polizei in general reacts to drones (not in cities‘ center obviously, but more flyable places)?

Maybe there is in general something important one should know before starting this hobby in Germany. Thanks.