raised bed depth and spacing Q's

Square Foot Gardening List - http://www.flinet.com/~gallus/sqft.html

Hi,
 
First off I'd like to say what a great group this is.  I've been lurking for a while now and I've already learned so much!
 
My husband and I are first timers and are trying to plan our garden.  (we live in southern CA -zone 9 or 18)  We've decided on raised beds and are now trying to guess what veggies and herbs will do best in this area.  I got really exited last month and bought a load of seeds on sale without thinking about what might actually GROW in this desert. So I'm going to forge ahead with what I've got and plan on learning the hard way what will survive! :)
 
A couple of pretty basic questions that maybe someone could help us with.  First:  How deep should our beds be?  As this is our first time we have NO idea what the soil is like under the grass.  How far down will most veggies send roots? I would like to try my luck with onions, carrots and perhaps leeks in the fall.  We initially thought 12" but perhaps 6..... any thoughts?
 
Second: I've been trying to find spacing for herbs but cannot seem to locate any for dill, coriander( cilantro), or mint.  Any suggestions ?
 
Thanks in advance for any help!  I'm sure we will be back with more questions as it all progresses.
 
Cheers!
Courtney and Alastair
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