The textbook for Evidence is Learning Evidence, Second Edition, by Deborah Jones Merritt and Ric Simmons, ISBN 978-0-314-27540-0. You will not need a rules supplement.
For the first class session, please skim pages 1-39, which provide valuable background information on how evidence is used, types of evidence, the Federal Rules of Evidence, and the structure of a trial. Please also read carefully pages 40-68.
The full list of reading assignments for the semester will be posted on TWEN in mid-August.