This is one of Mozart's simpler, early keyboard pieces, likely written for teaching or domestic use. It exemplifies his clear melodic writing and graceful harmonic progressions.
Emphasize a light, even touch and precise articulation, especially in the Alberti bass accompaniment.
Andante in C major is rated Henle level 3 of 9 — late beginner repertoire, roughly ABRSM grades 4–5. In the RCM system it corresponds to about level 3.
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 Andante in C major lasts about 2 minutes.
Andante in C major is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.