Having played now for a year with a New Orleans style brass band with players of differing skill levels, I can pretty much tell you that even if you could find charts, they would only hinder you. Most songs are only one or two chords and you'll take longer to memorize them if you rely upon written arrangements. We practice as a group, play a recording of the song we want to learn and then help each other out in figuring out the parts for them. With this process we can get a song mostly down in a night, reinforce it at the next practice and perform it after that. The same players that may have needed everything written down seem to get the hang of this pretty quick; and not surprisingly, still have to check their music for the stuff they learned by written arrangement (which were done by a member in the past).
For Dixieland, it's all mostly improv, but for the lead instrument playing the melody (generally trumpet) and certain set parts for the more intricate tunes. American Music Caravan used to provide wonderful fake books in C and Bb, that had not only the melody and chords, but also some of those set parts for the more intricate tunes. Still, you'd have to improvise the rest. They're out of business now though, and unless another player willed you their copy, you'd be hard pressed for them to part with it.