1st time visitor to OC/LA area
You don't say if you will be mostly in OC or if you're splitting your time between OC and LA? I take it you will have a car? Do you want high end ($60 to $100 pp) recommendations along with the cheaper end of the dining spectrum ($10 to $25 pp)? Are you interested in breakfast, lunch and dinner recommendations? Where exactly will you be staying? Where will you be traveling to for pre-planned activities or business meetings during your stay?
All that being said take a look at this thread for some ideas: http://chowhound.chow.com/topics/637615
Two prior threads for OC which may prove helpful to you in planning your trip: