Hi Arichman and welcome to 3DGS!
I personally don't know of many video-tutorials regarding 3dgs, as LordMoggy said you might find some via google.
You could also try the wiki: http://www.opserver.de/wiki/index.php
Or search the "User Contributions" forum.
Other than that you might also find some interesting stuff in the AUMs: http://www.3dgamestudio.com/aum.php