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Hi Adrian, congrats on your first scope. It's not much perhaps, but it will show quite a lot of the nebulae and clusters in the Milky Way and exploring these will keep you busy while saving up for something larger. Suggest you find a copy of Nortons Sky Atkas, or a sky chart, maybe even Sky Atlas 2000, and explore the clusters and nebulae on these charts.
However with respect to galaxies, apart from a handful of bright ones the rest will be beyond your scope.
The maximum useful magnification from a reflecting telescope is about 1.2X per millimeter of aperture. With your scope that means about 100X, which means a 6-7 mm eyepiece (eyepiece fl = focal length / magnification).
You can push it higher than this if you like, the image will be bigger, but dimmer and you won't won't see any more detail. 300X is definitely not useable on yours - even with my 180mm maksutov I don't go beyond 200X.
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