Noob Necro on a budget- 5k

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Hey all, I have about 5k to spend on a Necromancer, level 12. I know they don't need much, but, it would be nice if I could get a few suggestions on low-end items to buy. The wiki has some costly options and I'm not sure if it's built around the lower levels. I expect to be less than level 30 till around the end of the summer.

I think what I would be lookin to up would mainly be my HP and AC with Mana/int when possible. I could be wrong on this.

Should I go for one big item or try to fill the slots? A few nice items and whatever I can find cheap 50-100pp to fill the rest?

Thanks for the help.