i_am_red, I'll go ahead and answer some of the questions you asked, simply because I was in the same boat you are last year and would have loved to have my questions answered when I was heading in. I am finishing prep now, and will be back for 1st year next year in St-Jean.
First off, be aware, as others have stated, that the decision to send you to St-Jean is based on a myriad of reasons, as I had completed a college degree, yet still got Prep.
To begin with, you'll do three weeks of what is called FYOP (First Year Orientation Period), which is basically lots of PT, inspections, drill and administration stuff, led by the military staff there, to get you into it. RMCSJ's and RMCC's FYOPs differ quite a bit from what I've heard, as RMCC's is led by 3rd and 4th year OCdts. FYOP sucks because it is mind-numbingly boring, but stick it out. It gets better after.
You'll be part of one of three squadrons there: Iberville, Richelieu or Tracy. Each squadron is led by a Captain/Lieutenant-Navy and a Sergeant/PO. Each squadron is split into 2 flights: 1st years and prep years, and then further divided into sections of 10-12 people.
Once your 3 weeks of FYOP are completed, school starts, and the focus shifts from military to education. The weekend before school starts is when us first-year seniors (deemed "seniors" to differentiate from those in RMCSJ who just arrived) will be arriving from BMOQ (Basic Military Officer Qualification), and the ORBAT will be announced, designating the OCdts who will hold command positions throughout the year.
The weekly routine is mostly wake-up, dress, form-up for roll-call and then class. During spares you're free to do whatever: workout, homework, nap (although the staff from some of the squadron's don't like this very much, but it's how I spent the better part of my free time). Twice throughout the week you'll have organized sports, depending on what you choose to do.
Strewn throughout the year are weekend exercises or military classes, most of which are done in preparation for BMOQ which you'll do during your first summer. The exercises are fun for the most part, but we all hated the classes because, again, they are mind-numbingly boring.
This upcoming year should be better than the last, since this was the first-year the college had been officially re-opened since it closed in 1995. Most of the things that were crap this year should be fixed, so it'll be a smoother experience for you guys and gals coming in.
That's pretty much it for the structure and routine. How much you like it will mostly be based on how you choose to involve yourself in what's going on, and you'll make some great friends there that'll make you forget the ones you left back home.
Hope this helps, see you in a couple of months.
