If you need to use a Distro AROS 68k on WinUAE you simply have to load the two most recent ROMs that you find
HERE in the ISO Nightly Build, path Boot/Amiga/.
The two ROMs must be loaded on WinUAE as you normally do with KickStart, of course each in its place, the two ROMs can also be merged and create a single ROM.
If instead you want to boot AROS 68k from a Real Amiga then you have to map the Rom from file by adding some commands in the startup sequence, see AROS Vision Distribution.
On a Real Amiga AROS One will be very slow unless you use a very powerful expansion.