Having played a healer in various games, I have one bit of advice that I have yet to see posted...
Every player has a class they like more then others, and each of those think they know your class better then you do. If you get suggestions, like above, try them and see if they work for you. If they don't, move on and try something else. Being a healer can be one of the most rewarding or most aggravating things you do in any game. Play it in a way that you enjoy. If that means using or ignoring other suggestions, so be it. As long as you and your meat shield pet survive, it is all good.
Welcome to the fold of Healing.