What youll need:
Trinity Bars
WoWInterface Downloads : Outdated Mods : Trinity Bars 1.0
Deadly Boss Mods
Deadly Boss Mods :: A World of Warcraft AddOn
Omen
World of Warcraft Addons - WowAce.com
Recount
World of Warcraft Addons - WowAce.com
Pitbull
World of Warcraft Addons - WowAce.com
Prat
World of Warcraft Addons - WowAce.com
Grid
Grid | World of Warcraft Addons | World of Warcraft @ Curse.com
Quartz
Quartz | World of Warcraft Addons | World of Warcraft @ Curse.com
After you download and install all the addons your UI is going to look something like this.
As you can tell its a mess. What you want to do is delete all the action bars and hide all your bags cast bars and pet bars. To do this right click on the triniti bars icon on your mini map which looks like this.
Then when you click on a bar youll see that in the doc menu it says delete dock click it and your bar will be gone. Do this to all your bars.
to hide your bars right click the bar and select autohide as seen here
Now lock your bars by left clicking the trinity icon and right clicking this icon.
After you do that select create new that is located beside the delete dock icon
Then drag it to a spot you feel comfortable with (I chose bottom left corner) and left click to cheese how many buttons you want.
Then place all your necessary skills and abilities in the slots.
After you have done that click the screw icon on your mini map, scroll down to pitbull and turn of target and targets target buffs and debuffs as well as player buffs and debuffs.
Then disable your party, party pets, party targets and raid frames as we will be using grid.
Then put your unit frames in a decisive spot where you'll be able to see them vividly.
Once you've done that type /quartz into your char box to bring up the Quartz config menu. Then unlock the player and target cast bars and put them in a desired location.
Once you have done that toggle omen and grid by selecting there icons on your mini map, and put them recount and your chat box in a desired location.
Make sure that all your action bars and frames are you of your view so you are able to see incoming threats and are able to move easily.
And there you have it. A basic raid UI that can suite just about anyone.
Note: Deadly boss mods is pretty much self sufficient. It creates bars for spacial abilities and what not for each boss to warn you of any harm or when you need to do specific tasks. There is no real need for customization when it comes to DBM.