https://wiki.project1999.com/Human
Necromancer: 75 STR / 75 STA / 75 AGI / 85 DEX / 75 WIS / 85 INT / 75 CHA / 30 Bonus Points
Those starting stats are actually not bad. Iksar gets similar starting stats and racial regen but if you're dead set on human...
15 int, 5 str, 10 sta
This would give 100 int, 80 str and 85 sta. Not too shabby.
That's how I would do it if I wasn't playing an iksar necro (minmax)
Too many people suggest you dump 25 in sta, str or int. Spread it around, trust me it's just as good.
5 str will help you carry just that much more coin (weight reducing bags)
10 sta will give another couple ticks of lich (life tap)
15 int, I mean you use mana no brainer, it's your main resource.