I have released the latest edition of my handout on Music Preparation Fundamentals for Jazz Composers & Arrangers. It’s a 20-page crash course in how to notate your parts and lead sheets with maximum clarity and sight-readability in mind.
It’s available, for free, from the Music Preparation Resources section of this site.
I have also added a short supplement: Music Preparation for Large Jazz Ensembles, which I am making available for the first time. This brief document deals with some of the issues that are specific to preparing big band scores and parts.
I hope you find them both helpful!