While the same is not true for healers in the raid finder, you're the only one of your kind in 5-man content, where you're likely to start to learn to heal. Healing's a little tricky to get started with, just because there's not much scope to practice out in the world, without other players. I would definitely have a go with all your spells out in the wild, just to see what they do, but it's only going to be when you get into an instance that your skills are actually tested.
Starting as you mean to continue
One of the things that's going to affect your gameplay and learning experience as a healer is how you're getting started. Leveling a new healer from scratch is a great way to go, as the low level dungeons are pretty well stress free, and you'll get your abilities little by little, so you can learn how each one works and, just as importantly, weaves in with the other spells at your disposal.
Filed under: WoW Rookie