If you're looking for healing methods, you are pretty close to getting a good macro set up just with your ideas.

I would suggest that you macro out 5 simple targetting macros:

/target Toon1
/target Toon2
etc

Set these on F1-F5, or on your keypad, or whatever.
Then, all you need is your heals put on macros.

/cast Greater Heal
or
/cast Renew

Then, you tap your target, then whatever heal you want.

When I was doing a PVE team, I put this all on the keypad:

1 - target tank
2 - target dps1
3 - target dps2
5 - target dps3
6 - target dps4
4 - Greater heal (i put this here because it was right above the Tank target button, and you'll be healing the tank the most (hopefully))
7 - Renew
8 - Flash heal
9 - Prayer of Healing
PageUp - Shield

so, all my targetting and healing was on the keypad, and all my DPS was on the normal keys.