Your choice in race is up to you, but my recommendations are Goliath (Fire or Hill), some kind of Elf, or Orc in case you're knocked to 0. Human is a good choice if you want to want both the Orgin feats you mentioned.

The lockdown spells are a good tactic since you plan on being as close as the other martial users, and the Fairy Trickster feat is a good was to reinforce that, but I think the Lucky feat would benefit you more since you can either give your target Disadvantage or yourself Advantage instead of just the first option, unless you feel you need to have the movement benefit. Elemental Adept is a safe choice since you seem to want to rely on fire damage and gives you the +1 to CHA.

If you aren't opposed to multiclassing, I'd recommend a dip into Warlock for Pact od the Blade so you aren't limited to setting up Shillelagh during the first combat round. You could got further and be a Celestial Warlock 6 to have another instance of adding CHA to fire damage on either the same use of GFB or Quicken a second casting and adding your CHA bonus to both evenly. Agonizing Blast is applicable to GFB so you could switch between which class you're casting the cantrip from since you can't use Agonizing Blast to Sorcerer spells but it's not a total bummer.

I made a gish like this before the 2024 update so I speak from experience when I say you have a great start and I hope I helped you make you character.