Windows 8.1 instalation

Mar 26, 2014
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Guys,

Im about to format my pc and install w8.1 for the first time.
So I found a cheap genuine w8.1 pro genuine key at ebay. Now how to install it or register it at microsoft store. I've search the options in the store and I cant find the place where I put the key and download the setup from the site sooo what are now my options?

should I install w8 from a fake iso and then activate it with my genuine key or whats the recomended process?

I only have the key, no CD, no box nothing more.
Currently installed w7 on HHD, now I plan to install w8.1 on my ssd and format hdd to 0