First thing you need as a healer is a good User Interface, but what is a good UI. Well in genera a good UI should have all the raid information you need to raid as well as be as clean as possible so you don't say "I didn't see that void zone". There is many things that some people may need to raid but finding all of this together and clean is what may be hard. Well look not further I found a UI that is just for you.
This is what the UI looks like by default:To the bottom in the middle is your spell bars ( maxx is 3 ) to the right of it is Recount, and to the right of that is Grid (come by default along with clique)
To the left of the spell bar is Omen Threat Meter and to the left of that is you chat.
This is what it looks like to me in combat with Recount and Omen hidden.
Now I did not change much I just disabled a couple of things that I found useless and added some addons. Among there are AVR encounters ( its getting disbanded by blizzard in 3.3.5 ) and Deadly Boss Mods.
This UI is not the best but however comes with almost all you need as a healer or any class in general.
How to install it.
Easy click HERE it will take you to the LUI website where you have to click Download. Proceed to download the zipped folder and once downloaded extract all files. Head to your world of warcraft folder by default is on C:\World of Warcraft. Proceed to delete the folder named " Interface" ATTENTION : (It is recommended to save a copy of your OLD interface folder in case LUI is not for you) once the Interface folder is deleted drag your extracted folder named WoW LUI to your world of warcraft folder and re-name it Interface. You are now ready to log in, don't worrie your screen will not look like a mess. You should see the following picture if the installation process went right.Just click install you game will re-load and boom you got your self an awesome UI.