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Paul
Firstly congratulations on the scope, and on having the good sense to ask for help!
Mars is not easy to see at the moment as it is very low in the north, so you are looking through a lot of air, which is rarely still and makes seeing difficult.
When you say zoom I assume you are moving the focuser? This is only to focus, if you go out of focus, it will look bigger but you are not zooming or making the image bigger, just blurrier (is blurrier a word?)
The 25mm eyepiece is the lower power one giving about 48x in your scope and the 10mm gives higher power at about 120x. Use the 25mm to locate the planet then up the power with the 10mm to get a bigger image. Beware of power as it also makes the field of view smaller so the planet will move out of view quicker. It also increases the effect of the poor seeing.
Once you move onto Deep Sky stuff (galaxies, nebulae, globulars etc) you will probably find that the 25mm will be in your focuser 90% of the time.
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