someone could help me to do a workable windows vm?

Use vmware fusion. One of my friends uses utm, and hearthstone is laggy to the point that in battlegrounds given the delay, he usually has 30 seconds or less per turn do to the delay in utm because of the combat faze delaying too much. I can help you to create a vm in vmware fusion, I tried using utm and the thing was just... way too slow, the delay is terrible for simple tasks alone, never mind for something as complex as hearthstone, per personal experience.

A regular iso will work if you download it from microsoft, as long as its a iso of windows you'll be fine.
I don't know if your using intel or m1, but a iso of windows will work. Of course if your using m1 it'll have to be a arm version of windows but the iso will still work.

If you have an M1 or newer Mac, you'll need to manually build an ARM ISO from https://uupdump.net/, as Microsoft doesn't officially distribute ARM Windows due to their exclusivity deal with Qualcomm.

Try getting the iso from microsoft, from windows insider program.

I don't have a m mac, so I cant test it.