Cantrip: Mage Hand. Not only is it a bonus limb, imagine fighting a person and they decide to apply an unrelenting 5 pounds of force directly into your retina.
1: Find Familiar. It's a permanent entity, which you can telepathically communicate with while within 100ft, and you can see and hear through it, and you can use its senses, AND you can use it as a conduit for Touch spells. It's in the shape of any beast with CR 0. Let's list off a couple of those that are especially good. You can have a Baboon, an animal that, with the largest species, is nearly 4ft long and almost 100 pounds. You can have a bat, gaining its echolocation, and have it fly around. You can have a Cranium Rat, which is telepathic. You can have a deer, which is a big-ass fella. You can have a flying monkey, which is a monkey that flies. You can have a Giant Fire Beetle, which sheds light for a solid distance. You can have a Haungharassk, a big-ass snail that's bulky as hell and can remove curses. You can have a hyena, an animal that can hold its own against a lion. You can have an octopus, which is a deadly animal that can move through like... a person. You can have a pig, which is a big ol' bastard. You can have a scorpion, which is a scorpion. You can have a seal, and they're big too. You can have a space guppy, which can generate an air pocket.
That's not even the most serious part. You can have Chimeric animals. Chimeric baboons are venomous, Chimeric cats have tremorsense, Chimeric foxes change color depending on their surrounding to blend in, Chimeric Hares can fly, Chimeric rats have gills and scales, and Chimeric weasels emit glowing light from their eyes.
Even more significant is the Giant Fly. It doesn't have attacks, but it's a Large entity, and bulkier than a human, with enhanced strength, and very fast flight.
2: Enhance Ability. I could set up any stat before doing a specific thing.
3: Animate Dead. It funny.
4: Evard's Black Tentacles. I just think they're cool.
5: Teleportation Circle.
6: Move Earth. I'd use that to easily create housing.
7: Simulacram. I would leave them in one place for a year, then have them use Teleportation Circle every day until it was rendered permanent.
8: Animal Shapes. I would use it on my followers to turn them into birds and dinosaurs and shit, then send them out after my enemies. Or I could throw a sick party.
9: Wish. There will be no weaknesses if I only use it to cast 8th level spells and lower.