I've always liked the things PM can do. However, I never rolled one in the past.
First time I'll be making a wizard, I capped 3 sorcerers in the past so I'm familiar with the spells.

It's going to be a drow PM, pure wizard 20.

My goal is to be able to solo epic content very easily (Scroll farming in sands, red fens, etc...).
The question is : what should be my spell focus? Necromancy for FOD ? ... ?

What feats should I take?

Pointing me to a strong PM build or advice me would really help.

Thanks for taking the time to read and give me a hand.