<p>My son started in fourth grade too and he’s playing Pictures at an Exhibition tomorrow (now a senior in high school). Time flies.
I would get the teacher first and the trumpet second. Your new teacher will have definite ideas of what is best for him. He may even have a trumpet to lend to your son. I don’t know Westchester, but if there is a youth symphony there, call them and ask who teaches their trumpeters. If there is a college nearby, there may be a trumpet instructor on staff.<br>
I would encourage him to continue listening to jazz, but if I had to choose between a jazz teacher and a classical teacher, I would start with the latter and then add a jazz teacher after the basics are covered. If your son is set on jazz I would look for trumpeters that play that genre in your area and ask whether they teach.
We always passed trumpets by S’s teachers. They all had definite ideas of how good the instrument was and what would be best for S. Thus, I would find a teacher first and a trumpet second.</p>