Best way to remove a kitchen and replace with decent one.

Guys,
In process of selling a property which needs a bit of TLC.

The current old kitchen needs ripping out and replacing. What's best way to remove the units without too much damage? Walls behind it need skimming after?

Also, after a value for money kitchen as its only for selling purposes.

Go for a flat pack range or ready made carcasses or a used one?

Any ideas would be appreciated.

Thanks