Enchanters are a specialized craft school associated with the Scholar, relying on the skill set present there to open new skills. Gatherer and Spellcrafter also can provide the necessary skill. Enchanters are the masters of resource manipulation, being able to imbue resources with new and potent qualities or to even change them completely. Enchanters also craft and contribute essence-based construction materials to buildings and structures.
The best way to level is to create construction essence items and place them on buildings. However, construction projects requiring an Enchanter's skill at the proper level may be difficult to find. The fastest, non construction way to level is to make Tainted Orbs (2:1 at optimal), purify them to Essence Orbs (1:1 at optimal), and finally, purify them to make Purified Orbs (1:1 at optimal). The Purified Orbs can be sold to a Pawn Broker or used by an Alchemist to make potions.
Collection tasks require you to have the item collected in your inventory but do not require you to get the quest first. This means, for example, you can bring 200 Essence to the trainer, get the quest, immediately do the turn in (Greet the trainer), get the quest again, do the turn in, and repeat twice more without moving from the trainer.
Craft tasks require you to make the items after you get the quest. The best way to do this is to bring a load of the raw material to a trainer next to a refining machine, get the quest, make the item, greet the trainer (turn in), get the quest, and so on until the material is used up.
Report tasks are delivery quests designed to show you where the Quartermasters are.