Congrats..Keep on...tootin-and jammin'
Besides...NEVER LEAVING HOME WITHOUT AN INSTRUMENT ON BOARD, I never try to forget the lessons learned from my old trumpet mentor...the late Roy Cummings, UofW jazz studies and trumpet professor.
He always was such an advocate of doing things right so with that in mind the following links are always helpful about jam session etiquette.
www.phillyjazz.org/jams.html http://home.earthlink.net/~hsbecker/ http://home.earthlink.net/~hsbecker/Improv.html
Check out his links: Interesting stuff for any musician.