D&D 5E - Celestial Warlock Build, any ideas?

Thank you all for you input. I came up with a possible build and wanted to share it with you all to see what you all think? With this build I plan to start as lvl 1 Sorcerer and then move into Warlock. I'm not sure when/if I would switch back to some Sorcerer lvls but I don't see a reason to go past lvl 3 Sorcerer.

SORCERER
[Proficiencies]
- Start with Con & Cha saving throws
- Can choose Persuasion (fits my characters role-play)

[Lvl 1]
Sorcerer Origin - Favored Soul
- Divine Magic (cleric spell list)
- Supernatural Resilience (+1hp per lvl)
- Favored by the Gods (+2d4 on failed save or att, 1/rest)

4 cantrips:
- Firebolt
- Mage Hand
- Minor Illusion
- Sacred Flames (Cleric)

2 spells:
- Shield
- Chromatic Orb

[Lvl 2]
Font of Magic (2 sorcery points)

Extra know spell:
- Thunderwave

[Lvl 3]
2 Metamagic:
- Quickened Spell
- Twinned Spell

One addition sorcery point

Extra know spell:
- Mirror Image

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WARLOCK

[Proficiencies]
- Light Armor
- Simple Weapons

[Lvl 1]
2 cantrips:
- Eldritch Blast
- Green-Flame Blade
+ Sacred Flame (celestial)
+ Light (celestial)

2 spells known:
- Hex
- Burning Hands (celestial)

Patron - The Celestial
- Healing Light

[Lvl 2]
2 Eldritch Invocations:
- Agonizing Blast
- Repelling Blast

Extra known spell:
- Protection good/evil (Will be fighting hags and undead)

[Lvl 3]
Pact Boon - of the Blade

Extra known spell:
- Misty Step

[Lvl 4]
Feat:
- Polearm Master

Extra cantrip:
- Booming Blade

Extra known spell:
- Flaming Sphere (Celestial)

[Lvl 5]
Extra Eldritch Invocations:
- Thirsting Blade (attack with Pact weapon twice)

Extra known spell:
- Daylight

[Lvl 6]
Patron Feature:
- Radiant Soul (Celestial)

Extra known spell:
- Dispel Magic

[Lvl 7]
Extra Eldritch Invocations:
- Improved Pact Weapon / Kiss of Mephistopheles / Relentless Hex

Extra known spell:
- Wall of Fire (Celestial)

[Lvl 8]
Feat:
- War Caster

Extra known spell:
- Banishment

[Lvl 9]
Extra Eldritch Invocations:
- Improved Pact Weapon / Kiss of Mephistopheles / Relentless Hex

Extra known spell:
- Flame Strike

[Lvl 10]
Extra Cantrip:
- ??

Patron Feature:
- Celestial Resilience (Celestial)

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[QUESTIONS]

- Multiclassing spell slots, when adding all of them together can you then cast any spell from either class?
- With Metamagic, can this be used on the Warlock spells as well, or just the Sorcerer spells?

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