This set of pieces, cataloged as K.Anh.207, are likely minor works attributed to Mozart, possibly in a suite or dance form. They would exemplify the clear melodic lines and balanced phrasing typical of his style.
Emphasis on light touch and precise articulation will bring out the charm of these pieces.
9 Stücke für Klavier (K.Anh.207) is rated Henle level 4 of 9 — intermediate repertoire, roughly ABRSM grades 5–6. In the RCM system it corresponds to about level 4.
You should be comfortable at Henle level 4 — meaning you can already play level 3–4 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 9 Stücke für Klavier (K.Anh.207) lasts about 8 minutes.
9 Stücke für Klavier (K.Anh.207) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.