How do I change hard drive and re-install OS?

Hello,
I just bought a used Macbook Air A1465. I am new to Mac so needed some help with it.
I am looking to upgrade the hard drive since it came with a small 60GB. Can someone tell me which hard drive I need?
Is this one good? Seems pretty cheap! http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=271568710531
Once I install it how do I re-install the OS and use my product key? I don't want to have to purchase the OS all over again!
Thank you!

Create a new account as mentioned in this thread and then delete the original malfunctioning one. Or use an OS X installation disk to do a wipe and install of a new OS X.
https://discussions.apple.com/message/21973362#21973362

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