I'll echo others that wizard specialization is not a good enough deal. However, if you're set on being a necromancer, the spell selection is such that you're going to be the wizard subclass most oriented to melee because your spells are especially geared to maintaining/increasing your hit points. Therefore, as one of those damage wizards, I would suggest that the schools you can most afford to drop are Enchantment and Illusion.
Given that a number of the key necromantic spells at low levels are melee touch spells and that False Life and Vampiric Touch easily replace lost hit points, I would build a character who was generally oriented towards touch attacks. Therefore, I would recommend the following feat progression:
1: Skill Focus (Concentration)
1: Weapon Focus (Touch)
W: Scribe Scroll
3: Weapon Finesse
W: Craft Wand
6: Blind-Fight
9: Spell Penetration
W: Spell Focus (Necromancy)
12: Greater Spell Focus (Necromancy)
15: Spell Focus (Evocation)
W: Greater Spell Penetration
18: Greater Spell Focus (Evocation)
Given that a number of the key necromantic spells at low levels are melee touch spells and that False Life and Vampiric Touch easily replace lost hit points, I would build a character who was generally oriented towards touch attacks. Therefore, I would recommend the following feat progression:
1: Skill Focus (Concentration)
1: Weapon Focus (Touch)
W: Scribe Scroll
3: Weapon Finesse
W: Craft Wand
6: Blind-Fight
9: Spell Penetration
W: Spell Focus (Necromancy)
12: Greater Spell Focus (Necromancy)
15: Spell Focus (Evocation)
W: Greater Spell Penetration
18: Greater Spell Focus (Evocation)