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Hi Mark,
Your 10 inch Skywatcher probably has a 1200mm focal length.
The 25mm eyepiece gives a magnification of 1200/25 = 48 or 48X.
This is good for wide field views of star clusters and nebulae but too low for close views of planets.
Try some star clusters (e.g. 47 Tuc or M45 = the Pleiades in Taurus) or the Orion nebula or the Tarantula in the LMC to get an idea of how much better the views are through the scope then say binoculars.
For closer views of planets, you need around a 10mm eyepiece (1200/10 = 120X). For those times when seeing is very good, a 6mm eyepiece would give you 1200/6 = 200X. I would go with a 10mm first.
Regards, Rob
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