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You can do some "types" of astrophotography without a telescope and use just a dslr. Yes of course the lens on a camera is like a telescope it focuses light.
If you want to do widefield milky way shots you could do thaf with a dslr and a widefield lens 10mm to 24mm your max exposure time will be rulle of thumb 500/lense FL, 50sec on a 10mm and much less as yohr lens Fl increases. If you dont have dark skies then you also need to take multiple exposures and stack them. Stacking boosts signal and reduces the impact of noise.
A non goto dobsonian is not really suitable for imaging, you could do some moon or planet stuff and many years ago tried that. A goto dob with modern dslr with good video or dedkcated solar imaging camera like ZWO qhy etc you cand do solar planetary and lunar imaging. Note dobsonian is just the mount the telescope in a dob is a newtonian reflector and this can be moved to a equatorial mount...
Hmm im sure your even more confused , but the hobby of Astronomy is a long winding road. There is no one singular way to enter or exit.
My advise get a small alt az goto telescope , portbility means you will likely use it more. And secondly buy used gear from people who have been in the hobby. Id say a 6" sct on a simple goto alt az mount. This is more a observing setup but could be expanded to imaging planets and EAA deep sky. In parallel get yourseld a dslr and some widefield lens. For canon a used 5d mark ii or 6d plus samyang 14mm f2.8 lens. Nikon d700 or d600 (known oil issue but nikon will fix and provide lifetime cleqning or upgrade to d610) , same sayang lens, You could also go Fuji Xt1. A dslr will let you do yohr widefield milky way without any special tracking mount. Sounds like your friend can guide you on this.
Finally regardint procesing being fakery...
One of the greatest Photographers Ansell Adams said
"You don't take a photograph, you make it" composition planning and processing. The camera the telescope are just tools.
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