I'm relatively new at this myself, but I'll give it a shot.
Whether you call them multiple desktops or virtual workspaces, they are enabled by default. I'm sure there are several different ways to access them, but for immediate gratification, press Ctrl+Alt+[Right or Left arrow key]. Give it a try, and you'll see what I mean. If you're looking for the, perhaps more familiar, graphical representation of the multiple desktops, then right-click the panel, and then click "Add to Panel." Scroll to the bottom of the list and choose "Workspace Switcher."
I hope that helps.