ES you could do planetary imaging with a webcam through it, but there are much better options if you want to do DSOs as well. The problem is not so much the telescope (is the scope actually 1000mm long or is it only about 500mm long, Important to know this) as the mount. You might be able to track a planet for webcamming if you're careful but DSOs are only going to cause you grief with that setup.
Seriously, if you are thinking of astrophotography, including DSOs, then your minimum setup cost, to do it with a minimum amount of fuss, you are looking $3000 plus. Tha'ts a good motorised mount (EQ5 or HEQ or EQ6 (more expensive)), good quality small scope for imaging (that one might be ok, I don't know the quality of th optex), cheap guidescope and rings, Camera (DSI for about $500) and a reticle for manual guiding. And that's just to start with. If you want goto and autoguiding add another $1500 to $2500 to that. Roughly.
Hope I'm not putting you off
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If you want to just do planetary and lunar then depending on the quality of your scope you could probably do it with a webcam and a laptop (opps I forgot about that up above, add another $400 to $700 for a second hand one with serial port and parallel port as well (for long exposure webcamming. need parallel port (LPT1))
Hope that helps
