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The recommendations for Gouging Claw as the most damaging cantrip are quite accurate. But there are several other cantrips you might want, to attach other damage types.
Needle Darts; once you have 4 GP to invest in a cold iron & silver rings, you are ready to fight Fey/Fiends.
Telekinetic Projectile: prepares you to exploit bludgeoning, piercing & slashing weakness, or bypass defenses against such. (Note that Gouging Claw is p/s, so you really only need this for bludgeoning.)
Caustic Blast, Electric Arc, Frostbite & Ignition are good for leveraging weakness to acid, electricity, cold & fire. Learn them all and prepare the ones you think will be needed. Please remember that Ignition is the only one of these with a spell attack; the other three have saves.
Note that the first two above area an AoE/dual target cantrips. You can move and use them simply as cantrips without worrying about Spellstrike or Arcane Cascade. Also remember that Frostbite has a 60' range...
I recommend a 16 Int / 16 Dex start, with a rapier (or shortsword) as a finesse weapon.