Hi Ann,
Welcome to Dave Werden's forum. All good suggestions above so I won't repeat any of it.
If you're concerned about not being able to read bass clef don't be. I only read treble clef myself. The same with the other two who are in my section (
we're all trumpet refugees ). I would say about 80% of the music for baritone or euphonium is in both clefs. There are a few times that the music is only available in bass clef. Then I have to xpose it on Finale for all of us.
"Great Big Dreams For America". I've not heard this one before. It was always "Good Boys Do Fine Always".