Grab an AFD and look up your departure airport. Looks like Socal Departure will be your point of contact for departure/flight following. As soon as tower hands you off or as soon as you are clear their airspace contact Socal app. on 127.2 an request flight following if their workload permits. That will allow you to transition all those airspaces along the way and you will be appropriatly handed off. As for the Restricted areas check the notams and ask the briefer if they are active. Also once you get flying on your way just ask whoever you are talking to to verify its cold and you're set.