As I prefer not wasting precious disk space creating a Bootcamp partition, I downloaded VirtualBox for free from virtualbox.org and installed it. Then I installed Windows as a Virtual Machine. This lets me run Windows in a window on OS/X as if it was just another Mac program. I installed the VirtualBox guest additions, so I can resize the Windows desktop window and copy/paste the clipboard between Mac & Windows. I mapped a drive between Windows & Mac, so I can share files between the two. I used "net use M: \\vboxsrvr\Downloads" to make my Windows M: drive see my Mac Downloads directory. You can specify how many computer resources to allow VirtualBox to use, and adjust them later. I know many folks pay for Parallels, but I use Windows so infrequently, I prefer the free option.
Bootcamp has so many limitations and disadvantages for my needs, such as: requiring reboot to use unless using Parallels with special configuration, Windows files not included in Time Machine backups, no simple backup options, resizing of Bootcamp partition not allowed without reinstallation unless using for WinClone (which I purchased), not simple to share files between Windows and Mac, no integration with Mac desktop or apps, etc.
As such, Bootcamp is not the best option for most people. Good luck with your VirtualBox installation (or Parallels purchase). I have been very happy using VirtualBox for several years on several machines and operating systems.