Book discussion group ideas

We are trying to start a book discussion group for teens here at the library. One idea I had was to read some books that are series just before the next installment comes out. Examples: Breaking Dawn by Stephenie Meyer arrives in August. We could read Twilight in May, New Moon in June, and Eclipse in July. Also Brisingr by Christopher Paolini comes out in September. We could read Eragon in July and Eldest in August. What do you think?