If you have look through 'To be an airline pilot' its got a page with some good questions on it ranging from, if fuel prices change will i be charged extra?, what if course over-runs allocated time etc. Its certainly worth considering EVERYTHING that will cost you money too as this will affect your expenditure (obviously) but simple things like a sandwhich or a brew everyday for 60 weeks could cost a significant amount. I wrote out a massive list before i went to The Flyer show (which i must say was excellent) but i sadly dont have it on me in the office.
Imagine your the school manager and think of ways you can earn more money!