One at each location you will be doing hot work...or attached to your welding cart. One at each exit. I'd suggest 20# abc's at the exits (if you have more than one exit, 10's would probably be sufficient) & 10# abc's at the equipment. I had an extra 5# ext that I mounted to my welding cart. I...
Ditto, contact an HVAC company for the install. Also, have them pressurize the system before the pour so you can monitor the gauge during the pour to make sure a loop doesn't get punctured.
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Your options can get expensive quick. You can probably get away with grinding down the high spots and filling the low spots, that will minimize your floor fill. I'd suggest a high quality floor fill from Ardex that can support rolling loads. You will need to roughen the existing surface up and...