always have ES up on the tank
glyph lesser heal wave, chain heal (4 targets) at least, I use water shield as 3d but there are lots of options. have 3 buttons that only your healer has assigned:

1 = lesser heal wave on tank
2 = chain heal self (/cast [target=player] Chain Heal)
3 = riptide tank or self?

as said above you should also have an emergency heal button that casts nature swiftness and healing wave, will heal the tank for 14-20k. You should also have 4 buttons (numpad, f1-f10, etc - will only be rarely used) that heals individual people with lesser healing wave, as some bosses require only specific people to be topped off after targeted random damage.

My resto shaman is back to ele 99% of the time but when I was mb'ing him as resto the fights would consist of always keeping ES up, tossing an occasional lhw at tank (hits for 7-10k when ES is up, almost as much as healing wave for a lot less mana/time), and tossing chain heals on myself (dps all stacked up) to heal the group. I would occasionally use riptide but to be honest I didn't use it that often, although the spell is nice (increases chain heal effects by 25% etc).

If you have multi shamans dropping 3-4x healing stream totems for most fights covers aoe damage, as they will be healing the group for 700-1k every 2 seconds.