How many usb drives to install windows 8.1

Hi!
I hope that someone can help answer my question.
I need to install windows on my laptop.  It is an Air with 4gb ram and 256g drive from 2011.
So, I tried to download windows to my mac but that didn't work.  The windows store only allows downloading to a windows machine!
Ok, so I erased my usb flash drive and installed a copy of the software on the usb drive (it is formatted as exFat, I think).
Good, take this to my Air and start Bootcamp assistant.  Now it tells me that it will erase that usb drive to put the support software on there.
What the heck?  Wouldn't it have told me I needed two usb drives?  Is that possibly true? Can't both files be on one 32gb flash drive?
Am I missing something?  I've done a ton of stuff on mac over the years but this does seem difficult.
Peter

You can install Windows using Boot Camp Assistant, instructions located here: http://www.apple.com/support/bootcamp/
Or, you can install Windows using a virtual machine like Parallels, Fusion, or VirtualBox. Instructions located on their respective sites.

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