Open "Window Manager" in settings (xfce4-settings-editor to be precise), then setup keybindings.

My keybindings are (note: super means windows key on most keyboards):

• super+[up|down|left|right] to tile windows
• super+m to maximize the active window
• super+f to fullscreen the active window
• super+q to close the active window (rebound alt-F4)
• super+[number] to go to workspace [number],
• shift+super+[number] to move the active window to workspace [number]

If you want to download my bindings see them on github. To use them make sure xconfd isn't running (pkill xconfd) then replace your ~/.config/xfce4/xfconf/xfce-perchannel-xml/xfce4-keyboard-shortcuts.xml file with mine (same goes for backing up your config).