This is a compiled set of PvP UI Tutorials. (750mb here, IF THIS IS TOO BIG, CHECK 250mb, 125mb links at bottom).
This video is for anyone looking to learn how to create a functional PvP UI, as well as anyone looking to learn how to use MSBT, specifically the very useful trigger (alert) system.
The videos detail how to set up a basic functional PvP UI, starting from the very beginning (Unit frame, Bar mod, cast bar mod, etc). It has 20 or so minutes devoted to configuring Mik's Scrolling Battle Text, one of the best PvP addons in the game. It also has a section detailing how to use Proximo, as well as its limitations.
All videos, including varying resolutions, and each of the 8 sections can be separately downloaded at the link at the bottom, but the version on WCM is the highest quality one.
Mods covered in detail:
Bartender 3 (+4)
Mik's Scrolling Battle Text
+mentions of other useful mods
Full separate video listing: