Well melee teams can be done as many people have leveled 5 DK's/Pallys/Rogues though I've never done it myself. It just involves getting the mob near the whole team instead of just the leader so it takes a little more work. You can either move the healer up to the tank or back the tank up to the healer, whichever is more comfortable for you.

Though if you're going to give the two melee a try, I'd ditch the healer and go prot/ret or ret/ret. Having a healer is helpful for dungeons but I think you'd get better results going more dps oriented. You can still heal yourself and have plenty of oh crap abilities without gearing and specing one holy.

As for the healing, I did all my healing on my 5 man group with macros. It's the best and maybe the only way to go in my opinion. If I remember correctly, something like:

/cast [target="tank name"] holy light

set up on player2.