Hi, 2015 TCU CRNA grad-to-be here...
working during the first 8 months is your call...the classes are online...I have friends who worked full time up until we started school full time, and I myself did not work at all. It's your choice, nobody will follow up with you on it. I recommend giving yourself at least a few weeks off until the real full time on-campus classes start. Lots of people worked up until around the end of July.
I had a friend who picked up night weekend shifts during the fall semester, I don't know of anybody else who worked during the fall. During the spring is definitely impossible, and obviously during clinical as well.
The classes are insane when you start. I N S A N E. No matter how prepared you think you are for the time and work commitment, you are not, and anybody in the program will tell you the same. The point is that you begin the program knowing you'll be working day in and day out towards your goal and not giving up.
The clinical sites vary and change through the course of the year as clinical time gets closer. Some people (myself included) were offered clinical sites with the acceptance letter, others just found out this past week (2 months away from when clinical begins). Flexibility in anesthesia is a MUST, it will be tested often. Learn it quick
Best of luck, let me know if I can help!