At 1st level of spells you'll want Magic Missile, and Mage Armor. DN Spell list is very non blasty until higher level.
At 2nd level of spells you'll want melf's acid arrow, and invisibility, or another similar defensive/controlling spell. Also with advanced learning you can take shrivelling, which is 1d4/level dmg from BoVD.
3rd level spells start to get fun, if you have arcane disciple: Undeath, you can now animate dead, and desecrate, I'd recommend Fireball,(although you do get Vampiric touch now, for a real attack spell) and hold person, or blink, or haste.
4th level spells, if you use Relics and Rituals, there is some fun stuff, like Form of the Zombie(you become undead, with all the bonuses thereof), stoneskin, etc