If you haven't found it already, I would look at Wrightslaw:
www.wrightslaw.org Their publications and online info are extremely helpful when you are learning how to advocate for your child at school. I agree with 1frugalmom that the best investment I ever made for my 2e children was private testing - so if there's anyway you can afford it or go through insurance to get it, I'd highly recommend it. We started by asking our pediatrician what he thought we should do, and that's how we found the neuropsychologist we used. Our insurance also covered the cost of most of the testing since it was through a medical referral.
The second most worthwhile thing we did was to seek the advice of a local advocate. You can find advocate services at no charge in many areas - we found our advocate through the yellow pages link at wrightslaw - the link is accessible from the homepage, and contains contact information for service groups in every state.
Next piece of advice, put your request for the school evaluation in writing (email is ok); send it to his teacher, cc the principal and cc anyone else at the school that you know might be involved in the process (in our district that would be the special ed staff member, gifted services if there is a person in that position, vice principal, teacher). I'm not in CA so I can't offer you specific advice, but fwiw I was able to advocate successfully to get an IEP for my EG ds - half the battle is simply sticking with it and not being intimidated by what you are told by the school. You need to know what your rights are, and you need to understand as much as you can what is going on with your child (and that's where private testing was far more helpful for us than school testing).
I hope that makes sense - I wrote it in a bit of a rush. Please feel free to ask more questions!
polarbear
ps - the very first thing I would do, today, is to look for a local advocate's group on wrightslaw, and if you find one, call them up right now and ask them everything you've asked us here.
