Do I need a computer with nothing on it or a computer running Windows or Linux with AROS running on it?
What type of hardware do I need to run AROS well and what, if any, other software do I need?
AROS is about options. You can have a bare computer system and run AROS natively. You can have a system with multiple OSs on it and run AROS natively (though it's a tough install). You can have Windbloat, Linux, OS-X and run AROS via an x86 emulator. Perhaps the end of this summer, you'll have the choice of running it natively on EFIKA. Personally, I run AROS natively as the solo OS on a laptop.
Dammy