Agreed on the pool session - grab one if you can. Not sure what the schedule is, someone in the club should know - please post.
Typically the club recommends taking a white water course, but with your canoeing expertise you have
a very good head start. If you do take a course I recommend MKC - I've taken their courses twice.
Another option for you to learn your roll is come out to Bate Island (Island Park bridge) in the spring
(or late spring, depending on your tolerance for cold water) On Thursday nights club members meet there, paddle, practice rolling, and go for a beer afterwards. There are several members who have spare kayaks, you can possibly arrange to borrow one. (I have one, I can lend it to you, but its a bit big).
Don't worry about boat size - there's something for everyone. Just try a few boats to see what you like.
If you are comfortable hanging upside down under water, you'll eventually get your roll. No worries there.
Let me know if you have any more Q's.
BTW, yer gonna have a blast!
Mike R.