Once you have verified your build, enabling WSL is easy. Simply open PowerShell as an administrator and run the following command:
Enable-WindowsOptionalFeature -Online -FeatureName Microsoft-Windows-Subsystem-Linux
Once the installation completes successfully, you will be able to select and install your preferred Linux distribution. A number are available, but for running Ansible, it makes sense to choose one of those listed in the official Ansible installation instructions, such as Debian or Ubuntu.