Practice in mezzo register. Embouchure should be a finely tuned efficient working machine. Maintain the proper balance between too loose and too tight. Mouthpiece Don't practice mouthpiece buzzing, instead think about mouthpiece resonance. When practicing on mouthpiece use your natural placement setting.
Contact is the key word.
Lips must have contact with the mouthpiece. Monitor and watch out for this condition. Don't open mouth too wide, remember you must come back to set quickly. Play slow, smooth, connected slurs at mp moving from half step to wider intervals. Practice descending then ascending.