Here is a small program to get you started with Scheme: incr.scm.
The Dybvig textbook is available online.
You can download MIT Scheme
for most platforms, but remember your code must work on the university
systems, and we will not support other environments.
Note that the windows distribution, although it says you have to compile it yourself, does come with an executable in some obscure subdirectory. Search for *.exe in the install tree to find it.
The Chez Scheme home page has some useful resources, including the freely downloadable Petite Chez Scheme. Again, if you use this version, you must make sure your code works with MIT Scheme on the university systems.
If you know of any further references that you think would be useful, please let me know and I will add them here.