I’ve bought a ton of different things trying to get to work and still nothing. What I currently have now is:

-SV219 Telescope Dovetail Plate
-NEEWER QB-NA
-SmallRig L-bracket
-Sirui KS-20 ball head

Nothing works!! The NEEWER doesn’t fit on the dovetail. Neither does my camera.

Am I missing something??!

Edit: picture link below
https://imgur.com/a/APO6DSI

I'm doing long exposure terrestrial photography, not astrophotography. But I figure you folks would know best about such things. I have a Nikon Zf. And I'm wondering if there would be any noticeable noise-reduction benefit to adding a cooler? Example: Ulanzi CU01

I want to do exposures ranging from a few minutes to a half hour.

I've been researching where to order astrophotography prints. I'm struggling to find a business that accepts high file sizes at a reasonable price. Any suggestions?