To sum it up you will end up with with 4 Level 1 slots, 3 Level 2 slots, 3 Level 3 slots, 2 Level 3 slots from Warlock (recharged on short rest), D8 Bardic inspirations recharged on short rest (mostly used for flourishes).
Everything scales from Charisma and you’re perfectly capable to fight at any distance. Plus you’re a skill monkey, covering almost everything and getting jack of all trades for the rest. You also get loads of utility spells and can convert them into smites!
This build doesn't account for anything special like extra stats, which are easily missable.
* Will be fixed the moment you get Int circlet from the ogres.
Cantrips: Eldritch Blast, Minor Illusion // Spells: Hellish Rebuke, Hex
Spells: Agonizing Blast, Devil’s Sight, Command
Feature: Pact of the Chain // Spell: Darkness, Mirror Image // Unlearn: Command