Im looking for advice on choosing a cnc milling machine

Ive looked at axminster, syil, tormach, and denford cnc and xyz but out of my price range.milling machines.

I would like a machine that can do very small detailed parts up to machining 150mm square tool steel.

I would prefer single phase 240v so it can be installed in garage.

I havent done any cnc milling before .

What should I be looking for in a cnc milling machine?