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Hi Matt, welcome to the world of imaging. Where to start, the scope first i think. The LX200 has a focal ratio of f10, which in photographic terms means it is relatively slow to gather light but gives good magnification. I see you have other scope as well. It might be easier to learn the ropes on one of the other scopes, like the ED80. Do you have reducers for any of those scopes? Re the Canons, i know the 450D has a rear Liveview screen which makes focusing easier. Try and download a Bahtinkov mask (aka a focus mask) - you can getvpdf files online which you can cut out to create a very good focus aid, you can also but them from Bintel. These make sharp focus easy, get the size that fits your preferred scope, one size will not fit all.
With ISO, the higher the number the greater the noise. With a fast scope (say f5) you could shoot at ISO800, which is a good working speed for the 450D. Exposure time is going to depend on the speed of your scope ( f ratio), andbthe magnitude of your target. I would forget the Ha filter for now, it is much harder to gather light though one and produce an image on a dslr (this is because of internal blocking filters, and low red pixel population in the sensor.).
Hope that helps, i am sure others will be along with more info.
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