Telemann's 'corellisantes' sonatas are stylistically imitative of Corelli's Italian Baroque style, offering finely crafted melodic lines and clear contrapuntal textures. They are excellent examples of the galant style transitioning into the Classical era.
Developing a clear, articulate touch and mastering Baroque ornamentation are key to performing these sonatas authentically.
6 Sonates corellisantes 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 6 Sonates corellisantes lasts about 18 minutes.
6 Sonates corellisantes is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.