For AI's there is a fairly comprehensive guide right on your Conqueror's CD. There are probably better tutorials out there, but I've never had need for one, so I don't know where to find one off the top of my head.
As for BETA units, read da hobo's FAQ, somewhere on the first page. I don't know why a search wouldn't work, as I simply typed beta and 10 thousand threads showed up on the search page.
zyxomma100-
Age of Kings Heaven forumer
Proudly thwarting Dark_Aro's evil plans since 2002
"There is nothing more sad than watching a teutonic knight chasing a petard."