I would recommend and I think pretty well most of the board members would agree, that you should visit Binder Books
and order these three manuals:
TC-37F Parts Manual
GSS-1411 Service Manual
They are basic must haves. Until you have your own to peruse at your leisure, these manuals are already online at the Cub Manuals
The I&T Manual has some good info in it as well, but the GSS-1411 is far more detailed. Also, the I&T Manual is on the site as well.
Sure hope this will help you a bit..