Thank you so much. A follow up. A refractor is better for DSO photography than a reflector?
I am thinking of getting a HEQ5 mount and SKY-WATCHER EVOSTAR 120ED APO - 120MM REFRACTOR OTA. Is this a good combo for DSO?
Also, with the above combo, can I see anything visually or is this telescope only for imaging?
For easy use and learning AP, a reflector is the easier choice. Not the only one, just the easy one. I am glad I started that way after watching others take a different path. As to the combination you mention, there are issues.
First, the scope is too heavy for that mount if used for AP. Probably great for visual, but that isn't what you asked about. If you truly want to start with a 120, you need at least the HEQ6. That said, learning on a 120 will be more difficult than learning on an ED-80. If you are under budget constraints, then you could use the HEQ5 with and ED-80 to get started. If you can afford it, the HEQ6 and the ED-80 will make day to day stuff easier to learn, and down the road you will already have the mount that can handle the bigger scope when you are ready for it.
Scopes for visual and AP aren't really different (although the mount requirements can be) but in general you can do AP with scopes that would be difficult for visual as you need a LOT of light now for visual, and in AP we gather light over time. In AP you can get away with more affordable scopes if that is your desire. It was mine. As visual isn't great with my f/6 doublet, when I need to do visual (public star parties) I have been using EAA. That is a totally different discussion.
And if I have completely confused you, Ross's (rgsalinger) recommendations are 100% correct! A couple books are a very smart way to start in this hobby. It may be a few months before the clubs get back to socializing...