Always give the mirror time to equalize its temperature to the temp outdoors. I live in FL, so I usually let my scope sit for 45 minutes to an hour to allow it to cool. If you don't do this, you will be looking through marvelous, swirling air currents that will erase all detail from the object that you want to see.
Also get high-quality eyepieces.
If you have any specific questions I'll do what I can to answer. I have an Orion 8" Dob and love it. Enjoy.
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