Learn the basics of trombone playing including embouchure, slide positions, and technique. Instruction will help those new to the instrument, and build the basics of technique. Music reading will be a part of the lessons, but it would be ideal if basic understanding of musical notation was already part of the student's skills.
My Experience In This Subject
Played in high school, college, and as a professional stage and studio musician
A horn, music stand, chair. Optionally a tuner or tuner/metronome combination. If the student can't print music, then some type of tablet or screen to display music.