Now that is interesting! Considering that there is no set method of becoming a Necromancer, you will need to improvise. Also, considering that you will want high conjuration and destruction, I will suggest two races.
The Breton, which has 25% resistance to magic, +10 Conjuration and the spell "Conjure Familiar". The Breton is human-like and great for Mage-based characters
The Dark Elf (Dunmer), which has Resist fire 50%, "Ancestor's Wrath", +10 in Destruction and "Sparks"
Well, if you are going to be a Evil Necromancer, I suggest the Dunmer as it just looks more evil and bad-ass though the Breton has some bonuses that could help you out more.
Honestly, its all about the look, if you want a human-like or Dark-Elf, as the spells they start with can be purchased anyways.
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If your a serious gamer skyrim, if a casual gamer mw3
Destruction Spells.
The previous game to skyrim is oblivion which I found a lot more addictive than skyrim both very good skyrim superior with graphics but oblivion is a absolute classic .
The enemy AI is better which makes it harder to sneak effectively.
Skyrim because it's better
necromancer
Light. Heavy armor might get in the way and weigh you down. Light is much more attractive of course ;). Heavy armor does offer a lot of benefits though.
necromancer is way better because of stronger attacks better healing and the awesome mana boost move
Skyrim is the better game.
skyrim
None of them look much like them. You'd be better off modding them in.
They each have their perks. MW3 has the multiplayer playibility, but lacks a good, long story. While Skyrim has one of the best stories but does not have multiplayer. I bought Skyrim four days ago and haven't touched MW3 since