Joseph Grabowski was a polish officer attached to the Grand Quartier General in 1814. In his memoirs he lists on page 192 some of the personnel belonging to Napoleon's head quarters at the beginning of the 1814 campaign.

https://gallica.bnf.fr/ark:/12148/bpt6k930601s?rk=21459;2

Napoleon's Imperial Headquarters

Osprey

Ronald Pawly & Patrice Courcelle

In 2 parts

Revue Napoléon 1er, n° 60 (mai/juin/juillet 2011)

Dossier : L'Etat-major de la Grande Armée

Le grand quartier général impérial, un instrument sans équivalent (Jean-François Brun)

https://www.napoleon-series.org/military/organization/France/HQ/c_NapoleonsHQ1813PartII.html

I would suggest the work by Koch, especially volume 3

Mémoires pour servir à l'histoire de la campagne de 1814

https://books.google.de/books?id=qHgOAAAAYAAJ&dq=editions%3APveyBXnr1ooC&hl=de&source=gbs_book_other_versions

when viewing opt for double page.

Both Henry Houssaye and Baron Agathon Fain wrote books on 1814, so that might be a place to start.

We're all mostly new here, so don't feel alone.