There is a bit of info
on the Wiki, but it isn't too in-depth at this point. Adding more things as you figure them out would be very helpful, though.
In the Docs folder, there is a function reference file that lists all of the functions and language parameters. Its not a tutorial of any sort, but useful nonetheless.
To debug, I think you can use the DebugSettings.txt file to spit out some script debug logs:
Generate Game Debug Log := FALSE
Generate Engine Debug Log := FALSE
...
Debug Section Script Evaluation Detailed := FALSE
Debug Section Script Evaluation Simple := FALSE
Debug Section Script Evaluation Debug Print Only := FALSE