well i wanna make a char for farming after 71, what is the best build for mage? or is this the char i want?

If for farming you mean make wells/find items/make extra levels imho a magician is a godly build for do such things.

Make a godly magician is simple (but really expensive)

- Robe and Staff with +50 intelligence each item (or +60 ^^)
- Charm with as many ee as you can find (190+ ee)

Ofc this is a very godly build, but magician can be very effective at least with good boost int items and good ee charm.

thx, full int? and what should i aim at at low lvls for gear?

well if i were u i buy +10 int items @ lvl 0-20, then aim for charms that have +50ee imo items (low lvl) if u can later get +80ee @ higher lvl. @ +10 int u can find for 1fg i think then once u hit higher lvls bring up the +int if u can if not +10 is better then nothing it'll boost up ur dmg/mana either way and ur int gradually increases meaning more dmg/mana

what do i look for in the heal charm? what stats?

+enhance effect, a focus heal charm would be the best, u shouldnt need to waste much heal charm, here this is what i use just to give an example through lvls:

1-10 i just shrine items since my charm can take me there without a problem

10-30 i use this charm

Magical focused heal V
Level Req: 10
Heals: 71 to 85
Mana Cost: 45

with my gears (+10 int weapon, +20 int armor) this will give u about 100-200+ (around there) heal which is like what, a third of ur life?

from 30-55 i use this charm
Rare focused heal IX
Level Req: 30
Heals: 140 to 168
Mana Cost: 85

+89% Enhanced Effect
+9% Experience Gained

from my nears 30's i have an armor/weapon with about 30+int, really its up to u to buy how much int u want but its recommended to have very high int since this will give u a boost of offensive/heal charms effects.