The formats of publication and updating of court rules for the various states vary widely. Consult a librarian if you need help.
Usually the rules of evidence and procedure are published as part of a state's code, and are annotated with references to cases and other sources. Forms may also be included.
Both Lexis and Westlaw provide coverage of rules, including annotations, for all 50 states. Rules can be searched for individual states or in various combined databases.
Lexis and Westlaw also provide some coverage of treatises and practice materials for various states. Look in the database directories under the specific jurisdiction or under "Treatises, CLE, and Practice Guides" on Westlaw or under "Secondary Legal" on Lexis.
Many state courts publish their rules on their Web sites. Several sources include: