For a starting outfit, an eight or nine weight with a floating line gives room for a controlled cast and a strong running fish. Use a dependable reel, adequate backing and a leader suited to the fish and presentation. Keep loose line free of anything that could interrupt the first run.
For an observed worm-feeding event, a small worm pattern is a sensible first test. Match what you can see rather than assuming one colour or hook size covers every hatch. The aim is for the fly to travel with the food, so begin with a controlled drift and only add movement when the fish’s response suggests it.
Do not strike at every nearby disturbance. Watch the fly and line, then set into actual contact. If a school refuses repeated presentations, study whether your fly is at the right depth and moving at the same pace as the food.