This piece is a potpourri of themes from the opera Les Dragons de Villars, typical of 19th-century salon transcriptions. It combines operatic melodies with decorative pianistic passage work designed for the amateur market.
Focus on balancing the cantabile melody line against the decorative arpeggiated accompaniment.
Bouquet de mélodies sur les Dragons de Villars is rated Henle level 3 of 9 — late beginner repertoire, roughly ABRSM grades 4–5. In the RCM system it corresponds to about level 5.
You should be comfortable at Henle level 3 — meaning you can already play level 2–3 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 Bouquet de mélodies sur les Dragons de Villars lasts about 6 minutes.
Bouquet de mélodies sur les Dragons de Villars is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.