If you want the preview monitor to display in the full screen mode then you can press Alt and Enter. To add a clip directly to the Timeline use Control and D. If you want to split a clip you press Control and L. To set a starting trim point in a clip you can press Control, Shift, and I, and to set an end point you press Control, Shift, and O. To clear trim points you use Control, Shift, and Delete. To combine two clips you highlight the two clips and hit Control and M.