Hi Gary,
If you use transaction SE24, the ABAP class builder. You can find your class and it's associated methods and their parameters/exceptions.
If you are new to programming in ABAP Objects, might I recommend the following book
http://www.sap-press.com/products/ABAP-Objects%3A-ABAP-Programming-in-SAP-NetWeaver.html
I found it extremely useful when starting out. There is a lot of great content on SCN in this space also.
Cheers,
Katan