Firstly, if you have limited resources consider rerolling if you picked half elf as your starting race. Half elves start with 15 less wisdom than the next lowest being humans. Might not sound like much, but it is for a long time, especially if you won't be raiding much.
I know people say race choice is purely for aesthetics, but with certain classes some races do have substantial advantages/disadvantages. Just something to consider.
Basically the common advice given is to try to reach 200 wisdom. Once you have 200 wisdom, aim for raw mana items as you reach a diminishing return point with wisdom once you are over 200.
Buy cheap wisdom items, paw of opolla, charred guardian shield, golem tear ring, othmir fur cap, etc.
When it comes to quadding, not only do you worry about your mana pool, you also pick mobs that have lower hps, and you try to keep mobs with the same run speed. This is pretty obvious, but figure I mention it.
Example, Don't grab two beetles and two humanoids, the beetles will run much slower and mess up your quad.
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Don't quad casting mobs.