Do you have to pay for Windows 7 if you're going to create a partition?

Im wanting to play the best of the Window's PC Games on my Mac. So, I decided to go the BootCamp way. But there are a few problems.

1) I do not know where to find the installation page to download Windows 7

2) Do you have to pay for Windows 7 if you're intending to use it to create a partition on your Mac?

Please could someone get back to me on this

Thank you 🙂