The old 3.0 Mongoose Publishing book Encyclopedia Arcane: Necromancy had several great ideas in it, especially the spells. There was a 1st level Animate Skeleton spell and a 2nd level Animate Zombie spell, each of which limited you to only one of each ever. I can't think of a better way to have a low-level necromancer actually feel like a necromancer than by having undead minions right out of the gate.
I'd have to dig my copy out, but there were a LOT more spells along those lines. I run a Scarred Lands game with Hollowfaust being a mecca of undead goodness, and this book was near perfect for fleshing out that area of the world.