A good starting point would be what companies and universities are doing with them. Internet filtering is the norm(assume they are going to get around it, have a policy for this). While most companies have a list of allowable programs and then do not place a restriction on install; this may not be right for you. This part would depend on what kind of stuff the help desk will be doing. Monitoring software is up to you(generally not on corporate); personally, I hate it. For me this would severely restrict how i use the laptop(notes transfered to a flash drive to my real computer). it would never see any real use until i bought the thing and reinstalled the OS(even if you already did).
This is what my university is doing now with it's laptop program(I am not a part of it). Personally the monitoring is the crippling part of it. Most profs that i talk to don't use the monitoring part. This may be different with high school, considering most profs don't care what you do with class time as long as you aren't interfering with anybody else. There is one loop hole, and that is that someone can use their own laptop with the monitoring software installed(can someone say vm) (of course i know the prof and will be taking notes in dead tree form).
The main point with a laptop program are basically filtering, software install and monitoring. You find something for those and the rest should be a cake walk. That should give you a starting point, or at least some of what people are doing with laptop programs and my personal opinions on the policies as a student.
My sister opened a computer store in Hawaii. She sells C shells down by the seashore.