This was my plan. Making a Bardic leader who rides around with his undead army. Switch the feats around as you see fit and the spells are just what i would do. The reason for Goblin as extra language is for a way to talk about your team in secretish.
Race: Half-Elf
Speed: 30
Darkvision: 60
Fey Ancestry: Adv on Saves against Charm cant sleep magically
Languages: Common Elvish Goblin
Skill: Medicine, Nature
Background:Charlatan
Skills: Deception, Sleight of hand
Tools: Disguise Kit, Forgery Kit
Lv 1
Skills - Stealth, Investigation, Perception
Cantrips - Prestidigitation, Mage Hand
Spells - Identify, Healing Word, Sleep, Dissonant Whispers
Lv 2
Spells - Unseen Servant
Lv 3
Take Lore Bard
Skills - Religion, Arcana, Survival
Spells - Hold Person, Switch Sleep with Blindness/Deafness
Expertise - Deception, Arcana
Lv 4
Cantrips - Light
Spells - Invisibility
Take Feat - Magic Initiate:Sorcerer
Cantrips: Firebolt, Shocking Grasp
Spell: Shield
Lv 5
Spells - Hypnotic Pattern, Switch Dissonant Whispers with Dispel Magic
Lv 6
Spells - Speak with Dead
Magical Secrets:Animate Dead, Find Steed
Lv 7
Spells - Compulsion, Switch Invisibility with Greater Invisibility
Lv 8
Spells - Polymorph, Switch Hypnotic Pattern with Hallucinatory Terrain
ASI: +2 Cha
Lv 9
Spells - Geas, Switch Hold Person with Hold Monster
Lv 10
Cantrips - Message
Spells - Wall of Force and Counter Spell, Switch Dispel Magic with Modify Memory
Lv 11
Spells - Guards and Wards
Lv 12
ASI: Inspiring Leader
Lv 13
Spells - Mordenkainens Mansion
Lv 14
Spells - Finger of Death, Create Undead
Lv 15
Spells - Feeblemind
Lv 16
ASI: War Caster
Lv 17
Spells - True Polymorph
Lv 18
Spells - Wish, Meteor Swarm
Spells at the end
1st: Identify, Healing Word, Unseen Servant
2nd: Blindness/Deafness, Find Steed
3rd: Animate Dead, Speak with Dead, Counterspell
4th: Compulsion, Greater Invisibility, Hallucinatory Terrain, Polymorph
5th: Geas, Hold Monster, Wall of Force, Modify Memory
6th: Guards and Wards, Create Undead
7th: Mordenkainen's Mansion, Finger of Death
8th: Feeblemind
9th: Wish, Meteor Swarm, True Polymorph