I wouldn't say it is a senseless post, just that it is extremely ambitious to tackle something as complex as a flight stabilizer, even if you already understand the background material.
A good place to start with PID in robotics is a 2WD floor robot or boat that should travel in a straight line along a given direction. You have come a long way if you can program it travel in a square path and return to the starting position.
Another good starting project is a horizontal platform stabilizer. There are plenty of posts and tutorials on those.