Richard N. answered 04/25/24
Principal Trumpet of the Southwest Michigan Symphony
Logan B provide a great answer and I'll just add one thing: hook the bump of the upper lip inside the cup of the mouthpiece, set the "mmmm" formation, breath out passing air through the lips then slowly closing the lips to create the first buzz. After you have that buzz, hold it out as long as you can. Give this a few reps. Then put the mouthpiece to the trumpet and play a middle G. There, you just played your first note on the trumpet!