I would
start with c-script because 99.999% of the tutorials and all of the templates are in either c-script or its predecessor WDL. You're going to get a lot more help a lot faster with it, and c-script isn't going anywhere anytime soon, so anything you learn or create isn't going to be a waste of time. I'd start by downloading the excellent c-script workshop from the downloads page:
English:
http://server.conitec.net/down/cscript.zipDeutsch:
http://server.conitec.net/down/cscript_d.zipEspaņol:
http://download.conitec.net/cscript_s.zipI've been using 3DGS for over seven years, and I have no plans to learn Lite-C anytime soon. It's not that much different, so it isn't like it will be that difficult to pick up on. Also, Lite-C is still in early beta and will not be at release candidate status for many months, and it will be the scripting language or more accurately, an alternate scripting language for A7...not A6. However, it will eventually become
the only 3DGS scripting language, however that's years away (A8?).
Finally, here's a page describing steps to convert from c-script to Lite-C:
http://www.conitec.net/beta/litec_migration.htm