Someone commented that their letter didn't say anything about the extra expenses such as CPR, ATI, immunizations, etc. You should be getting all that info during the orientation for your specific campus.
As for working while attending school, would think that would be difficult. It's not impossible though. I feel fortunate that I did not have to be a mom, work, and go to school all at the same time (lots of awesome family help with this) but there were others in my class that had different situations. Several people would head to work after classes, others only worked on the weekend. I think in the end it comes down to doing what you know you have to do and that may mean working while going to school. You just sort of learn how to do it and stick to it until you finish. At least that's what the guys and gals that I am in class with are doing.