The Jmol home page at http://www.jmol.org has links to documentation, examples and further information. The Jmol scripting language is fully documented with interactive examples at http://chemapps.stolaf.edu/jmol/docs/. The book How to use Jmol to study and present molecular structures Volume 1: Learning to use Jmol (basic and intermediate levels) by Angel Herráez (ISBN 978-1-84799-259-8), available from www.lulu.com, is an excellent introductory primer.
Jmol has often been used in online tutorials. Many of these are indexed from the Jmol home page and can provide useful hints on best practice in organising the information channelled through a Jmol-enhanced figure. The Jmol Tutorial-Authoring Template (JTAT) (http://bioinformatics.org/jmol-tutorials) is another valuable tool for developing authoring skills.
Professional Jmol scripting services are offered by Frieda Reichsmann of Molecules in Motion (http://www.moleculesinmotion.com/).