Well, as to Valencia....What's out there are the colleges - and students to fill those apprentice holes. BUT, just in case, what kind of apprenticeship are you seeking, and what skills do you have to offer? There is work - Magic Mountain is there, and they are always looking for employees on every level. It's pretty far to commute to LA, but if you can go the other direction from traffic, there are some little community theaters in Lancaster/Palmdale (in one direction) and Burbank/Glendale (in the other). And where are you coming FROM that heat doesn't bother you - trust me, desert heat is beyond enervating, along the lines of what a really humid East Coast summer does to your system.
Either way, break a leg...