I’m sad dual specs won’t be in from the start. Leveling as healer, specially in classic, is horribly slow.
Maybe LFG can help some. But in the old classic era, it sucked big time imho. And doing quests took forever if even possible solo. Until the dual spec is added, leveling as dps is probably the only option - focused on quests, then respec and stop doing open world content unless in a group with a friend or two.