For a list of the commands, look in Help > Command Reference
For the command aliases, open your .pgp file in Notepad (in LT I think it's ACLT.pgp.
You can find some great lisp tutorials here: http://www.afralisp.net/
Lisp won't work in LT without an add-on though.
This link may help you get started with macros: http://autodesk.blogs.com/between_th...d_tip_mac.html