Group Heal?

What is the best Healing spell/skill for a group with effect over time? I am just burning though my magicka trying to heal a group and stay alive!

I believe restoration staff is what you're looking for with plenty of HoTs and some AoEs. If you want to be a healer then light armor is strongly advised, as its passive abilities allow you to regenerate magicka a lot faster than with any other type of armor. You may also want to look into certain types of consumables, such as drinks, because they provide similar benefits.