Mike,
A good link is
http://www.scka.org. It has information on some of the launch areas. Another good place to check is the southwestern forum on ikitesurf.
I have tried a couple locations in the north bay. I have been to Leo Carrillo and Zuma. Zuma is more wide open and has less pressure because it is typically a little less windy. I liked Zuma because I could ride the waves without having to get into a lineup. Leo Carrillo is a lot more popular and some days it will be windy enough to ride there, but not at Zuma. Leo has a nice area with relatively flat water due to kelp beds upwind. However, a lot of other riders seem to like the flat area as well. The waves are nice at Leo as well, but you will have to share them with other riders. The other popular area to ride is Topanga. I have not been there yet. I understand that it is a tight launch.
If you want warmer water and the most consistent hair blower wind you have ever experienced in your life, drive down to Belmont or Seal. Of the two I prefer Seal, the water is cleaner and warmer, but you do have to shuffle your feet because it is a string ray paradise. If you tack up wind at Seal there is a big flat water area that is very sweet. You can land just about anything in wind that consistent and flat water.
I advise staying away from Cabrillo. It is one of the more windy locations, but it is also popular with beach goers. The water is always very cold, the wind is always very gusty and downwind are big nasty rocks. If you don't feel comfortable going to DC by yourself, you don't want to go to Cabrillo.
Rat Beach is nice and scenic, but the wind is very difficult to forecast there. I kite it a lot because it is only 10 minutes from my father-in-law's home.
My favorite spot is Zuma, with Rat Beach and Leo tied for second. All can have very intense wave action. So check the surf report before going to those locations. ikitesurf is the best spot for forecasts and up-to-date wind reports. I usually do not decide where I am going to go until around noon. The wind is more difficult to predict there due to the Catalina Eddy. Some days the Eddy shuts just about everything down. On those days, Rat Beach often fires when nothing else does. Good luck down there. I am still sore from kiting 4 out of 5 days.
Kenny