Ahhh this is in the F2P forums so I wasn't sure if F2P or vet. Black magic is literally the only enchant that is known to work. It happens to give a tiny bit of haste (scales to level), and only on spell procs. So caster classes can proc it. Blood Elf AoE and Undead on-hit racials can proc it too.
For now, get the white neck, rings, and offhand (if need be) for all your twinks. Level engineering and get any relevant (correct armor type) + trinkets gear. Then get dungeon gear (ilvl 26). Then do BGs, which can drop ilvl 28 gear (rarely). As a veteran, you can get slightly above the ilvl where it matters (34). With F2P its stupid hard or impossible depending on the class to get above 34, so gear doesn't matter. So really just make sure you're wearing all of the correct armor type and use a wand if you can. You can read the guide in my sig if you want a lot more detail (its oriented to 19s, but the concepts all apply with 1 higher ilvl).