The goal of using a window manager is basically making your own custom desktop. The majority of apps are configured through text files. If you want to try Linux, you can pick a beginner friendly distro like Fedora which will give you a desktop environment. These are desktops with the batteries included and are fully customised through GUI settings menus.

Fedora KDE is a great option if you want to try making a very custom looking system without having to worry about installing a ton of different tools and editing config files.