Which version are you using? If you have version 10 it comes with a good tutorial in the Examples Directory (typically C:\ISE_TCAD\tcad\10.0\Example_Library\ISE_Training).
If not you can request a training package from ISE. I do not know if this seperate package is still available since Synopsis has bought ISE.
I am doing some research in SOI CMOS by using ISE TCAD,and my edition is ISE 9.5, If u have time ,i think we can communicate experience on MSN,my id isrometheus_1982@hotmail.com