Hi, what are the other parts of your equipment? As a minimum you need a camera, a tripod / mount and a lens or telescope. The combination has to fit together i.e. the tripod and mount have to be sturdy enough to support the scope. Depending on what you have you may consider to take your first steps just with a camera and lens combo. A good introduction is the narrowband channel on youtube The Narrowband Channel - YouTube or Niko Carvers Nebula Photos: Nebula Photos - YouTube.
Have fun and clear skies
Wolfgang
I want to buy a Skywatcher EQM-35 PRO, a Nikon D5600. What do you think?
I can't comment on the mount, going for a Nikon or Canon camera is certainly a good choice since they are well supported by astrophoto software. The fact that you intend to buy a camera may indicate that you're not only new to astro photography but to photography overall. If this is the case the learning curve is even more steep. I can only support Brian's suggestion to start small and easy. The channels I recommended to you will show you, that you can do a lot with a simple camera + tracker + lens. It will save you both money and frustration. And there is a surprising number of large objects in the sky you can capture with a lens.
You may check the "Samyang 135 f2 group":
Samyang 135 f/2 - AstroBinThe Samyang 135mm is a relatively inexpensive lens and a great starting point.
Of course don't forget to look at Brian's images for excellent examples of what can be done with a camera and a lens. As Brian states it's not only the equipment, a lot of work will go into the image processing.
The good thing about astrophotography is that most objects in the sky will return on a regular basis. So if you don't have the equipment or the skill to capture them this year you may try any time later. There are exceptions of course of some rare events but just don't bother about them as a beginner.
As a tipp for a tracker: Skywatcher is about to release the new Star Adventurer GTi which looks quite tempting and may serve as a good beginner mount (
Sky-Watcher | Sky-Watcher Global Website (skywatcher.com)). Obviously as a new product we don't know yet how well it performs in practise. I expect plenty of reviews coming up the next weeks. iOptron Skyguider and the current Skywatcher Star Adventurer 2i are trackers with a good reputation.
I forgot in my last post: In addition to the youtube channels I recommend to you the great book "Astrophotography on the go" by Joseph Ashley. It focuses on AP with lightweight equipment and short exposure time.
Good luck and clear skies
Wolfgang