Follow the instructions given to you by the Open Boot Camp Assistant. It's in the Utilities folder of your Applications folder. Use Boot Camp Assistant to create a Windows partition The default Secure Boot setting should be set to Full Security and if not, you can look at Apple's official guide to check how to change the boot security setting if you are encountering problems. Make sure you have all of these ready to go because there are several steps to the installation process.
If you want to play Valorant on Mac, here is what you need: