Levelling as shammy

Hello, I'm planning to start playing as resto shaman. I would like to focus on healing since I'm bored with dpsing. How levelling looks like on healers in tbc? I played on tbc realm once but as a frost mage so I don't know if it is viable option. I'm gonna focus pve playstyle mostly.

Levelling with a healer spec in Tbc is pretty much hell on earth.
You could go Elem and still probably be able to heal dungeons thanks to having +sp gear