You have an Early 2011 MacBook Pro, which it's compatible with Windows 8. All Mid 2010 and newer MacBooks Pro (except the Mid 2010 13-inch MacBook Pro) are compatible with Windows 8, so you can use it without any problem.
To install Windows 8, make sure you have a copy of a full version of Windows 8 or Windows 8 Pro. Then, open "Boot Camp Assistant" (in /Applications/Utilities) and follow the steps to install Windows (make sure you mark the option to download the Windows support software, because you will install it after finishing the Windows installation). If you need the steps to install Windows, print > http://manuals.info.apple.com/en_US/boot_camp_install-setup_10.8.pdf
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