I'm a former horn player myself. Very former. Your skills will do you well. Here's how I WISH I has started with guitar and am having to play catch-up. Learn scales, at least the major scale, the minor scale, the blues scale (flat the thirds but play a major seventh). Practice the chords used most in the music you want to play. For me that's A, C, D, E, G, F, F#m, Em, Dm, E7, A7, D7, B7. Learn arpeggios and inversions for those chords too. Don't JUST do those things. You need to learn the chords well enough to switch between them in time to make songs, but those are things to practice.
How should you practice them? Well, go to the site ApeDoctor recommended. It's wonderful. I wish I had known about it when I was just beginning. I reference it frequently now.
- Zurf
Granted B chord amnesty by King of the Mutants (Long live the king).
If it comes from the heart and you add a few beers... it'll be awesome! - Mekidsmom
When in doubt ... hats. - B.G. Dude