That's a good starting point. The next trick is to be familiar which what different schools need/want. There are a number of educational projects (the French seem to dominate here) so you might have a look at some of the LiveCDs provided by those projects.
The Linux Terminal Server Project was already mentioned; that basically converts a small computer into a terminal which will run software on a far more capable server. Ubuntu has an option to set up LTSP to serve up an Ubuntu image.
Unfortunately having a good setup and good tools doesn't mean they will be used. In Australia (New South Wales) for example, the attitude is that money for computers and computer programs comes from somewhere else, so school administrators generally don't care about good free solutions. I'm hoping the state government announces that the school computer budgets will be cut to 1/3 in the following year ...
So, go ahead and learn and set things up - but be prepared for a long hard fight to get people to use things.