Hey, I am new and looking into using Dim3, but haven't been able to find any plain and basic tutorials on the overall usage of Dim3 and all its aspects. Can anyone direct me to such a tutorial?

Why did you post the same thread twice? One is enough.
Uh, didn't really know where to post. Sorry.
Thas alright, you can delete the other one. Welcome to the forum.
The docs would probably have what you need. If not, then look at teh1ghool's mapping tutorial
Professional Maps