What's the best way to set up a Windows 10 machine?

My daughter has asked for a Windows laptop for Christmas, for schoolwork and games. I'm a Mac user and haven't set up a Windows machine for many years so I'd appreciate any advice ... except "get her a Mac/Linux" from below the line! Windows has changed a lot in the past decade, and now it's a mobile operating system. If your daughter has some experience with Google Android, she'll probably cope quite well. Many of Windows 10's main features came from the mobile world.