This is an example of an early 19th-century arrangement meant for amateur home performance during the Napoleon era. It features functional harmonic progressions and straightforward rhythmic drive.
Focus on the steady, driving left-hand rhythm.
Comparable difficulty and character — good candidates for what to learn next.
Buonaparte's Grand March is rated Henle level 2 of 9 — beginner repertoire, roughly ABRSM grades 2–3. In the RCM system it corresponds to about level 2.
You should be comfortable at Henle level 2 — meaning you can already play level 1–2 pieces cleanly. Learning it one level early is possible as a stretch piece, but more than that usually leads to months of frustration.
A typical performance of Buonaparte's Grand March lasts about 2 minutes.
Buonaparte's Grand March is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.
Pieces at a comparable difficulty and character include Blüthenregen by Carl Bohm, Bouquet-Royal Galop by Hans Christian Lumbye, Alexander's Bag-Pipe Band by Edward Ray Goetz — see the full similar-pieces list on this page.