Ismael,
Welcome to SCH.....Nobodies going to tell you exactly where to find a covey of quail.....Having a known covey is pretty sacred & held tight to the vest.....What I can tell you is, there's Gambel quail in much of the desert edges of Imperial, Riverside, & San Bernardino Counties....Lots of BLM out there too.
Valley quail are most everywhere here locally & in California.....The biggest problem is finding public land to hunt them (the drought has hurt too).....Kern County is still considered one of the best places to find valley quail.....Lots of public around places like Lake Isabella, the Scodie Mts, Kelso Valley, and Ridgecrest.
Mountain quail are in most mountains in SoCal, but are the hardest to hunt.....They mostly live in small coveys in the highest & thickest willow bottoms or buck brush.....Again, Kern Co. was my favorite place to hunt them on a consistent basis.....San Diego Co. has them too.
Also, in many of these same areas of the desert are chukar.....Quail like partridge, that can be right in with valley & mt. quail.....Ridgecrest, Black Mts, Randsberg, Stoddard Wells, are just a few of the places I've shot them.
Check out national forest maps, blm, & wildlife areas.....Google is your friend when looking for info as well.....I think the DFW website may even mentions spots or more areas.
Quail & chukar season always opens the 3rd Saturday of October.....So there's plenty of time for scouting......Good luck.