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A few questions to help clarify your problem.
have you looked through a telescope before - guess what I'm asking here is do you know what you should be seeing? Sometimes people have expectations set by flashy long exposure colour photos of the skies in astro adverstising that have little resemblence to what can be seen by eye at the telescope.
what are you looking at when you see the bright dots, I assume stars. WHen focussed, stars should appear as pinpoints of light of differing brightness regardless of magnification. In fact the more the magnification, generally the poorer the views and the pinpoints become shimmery - so I sincerely doubt you need higher maginification eyepieces. I'm assuming you are focussing to get the stars as sharp as possible - it they don't appear sharp it is possible that your scope needs to be collimated (adjusting the alignment of the mirrors). This is not hard, but is fiddly and something you'll need to learn.
finally, try using your scope in the daytime on distant objects to confirm you can get focussed images. When the skies clear, turn it on the moon as your first target and hopefuly you'll see something worth your while.
hope this helps - no doubt others can add more.
cheers,
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