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You can start taking astrophotos right away. I'm not sure the exact procedure for the 300D but if you have just a standard lens and tripod, or if no tripod rest the camera on books or something similar, point at the sky and give 15 seconds exposure with the lens on the widest aperture on around ISO 800. You may have to focus on a distant street light first to set focus.
When I don't have a tripod I ckock the camera lens up with playing cards to point up.
For deep sky (galaxies, comets, nebula) a fast telescope in the f4-5 range will be better than a slow f10 telescope. Planets are the opposite.
A good equatorial mount is a must, preferably with dual axis drives but as mentioned before shooting "through the scope" take some long exposure piggy back photos first to get the hang of it.
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