Tips for a brand new Necro?

[GigasLugian]

I decided to roll a necro, either Gnome or Human. I know gnomes have higher int starting, but humans have more hp/overall stats and I kinda know their starting area. I don't think I've ever been around Gnome starting area.

Can someone explain the hate aspect that necros get? Like, what cities are off-limits the entire game? I know you can do quests or turn ins to increase faction at certain places. Also, how hard is it to deal 50% dmg to a mob so you get full exp?

Any tips greatly appreciated!