After you have the trumpet all set up put the mouthpiece up to your mouth, relax you jaw and put your lips together.
Blow into the trumpet but don't let your cheeks puff up, try and blow your air straight and not up and down.
With you right hand rest your index, middle, and ring finger on the valves.
Notes you will need to know: Low C is no valves, D is valves one and three, E is valves one and two, F is valve one, G is no valves, A is valves one and two, B is valve two, and High C is no valves.