How do I build jazz harmonies within a 5 piece hornline?

Hello, I am an amateur composer who has spent more time performing than composing as I am a Music Performance and education Major. I recently been asked to write a couple of pieces for a 5 piece hornline that is centered around jazz and I was wondering how you would typically write the harmonies? I have had a couple ideas in mind, but I want to avoid sounding like a classical composer trying to write jazz literature as much as I can. If it helps, the instrumentation that I have is 2 trumpets, 1 alto sax, 1 trombone, 1 bass trombone, an upright and a drumset.