I’ve never astrophotographed before, am looking for a camera, i.e. DSLR, mirrorless, Specialty CCD, CMOS, the choices are daunting.
If you’re shooting long exposures for deep-sky images, then yes, you should still shoot flats.
I made an online Realtime Intrusion Detection System that you can use to tell you what Near-Earth Objects (NEOs) are visible to you for imaging -- NOW.
Choosing a camera for astrophotography can be hard...and expensive. Maybe I can help with this short video explanation of the main differences between them.