Play what you want from the beginning. Don't get distracted by a slightly more difficult beginning. Why waste the 6+ days played on a mage/necro (Wizards aren't even close in terms of twink/farming ability or raw power, believe me) when you could just spend that playing the class you prefer?
Plus, from probably 10-50 or so you can swarm kite quite easily (Others are posting screenshots of 30+ mobs killed in a single swarm, i've personally killed 25+ even at only level 11-12) and effectively. A Mistmoore battle drum and Gypsy Lute are very cheap to pick up nowadays, although those aren't even an absolute necessity for doing it.
If you're a careful, studious player, you can probably level faster than anyone else during that time because of how good swarm kiting is. It's very dangerous if you make mistakes, but that's what practice is for
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Later on, you can quest your own lambent and know you built your character from the ground up. Much more satisfying...