This is an easy question, as it falls under the Socal TEC Route System (Tower Enroute Control).
Basically, you'll never leave approach airspace, and never talk to center.
Routes and altitudes are as follows:
LAXM45 (VTU4.VTU) 6000ft
Speed is generally Controlled by SoCal Approach as this is VERY busy airspace.
Full Information on these routes & many others for the LA
Area is available at the virtual LA
Center's website from VATSIM: http://www.laartcc.org