Don't move, if you don't have to.
CA has a high cost of living. So, unless your salary is being raised to compensate for the higher cost of living, it's not worth it to move to CA. (if you are not being paid minimum of $70k a year, it's not worth it. because less than that and you'll be barely living from pay check to pay check due to the higher cost of living)
As for firearms...
You can not bring any prohibited weapons.
Prohibited weapons would be "assault weapons", Destructive Devices, Machine Guns, Short Barrel Rifles, Short Barrel Shotguns and Noise Suppressors.
You can not import any large capacity (11+ round) magazines into CA.
You can legally import magazine parts, which you can use to make permanent 10 round magazines or keep as parts & never assemble them while in CA.
All handgun(s) you bring to CA must be registered with CA DOJ.
Currently (changes on 01-01-2014) rifles, shotguns and other firearms do not have to be registered.
In order to get a carry permit, you have to apply to the CLEO of the city/county you live in.
Los Angeles County Sheriff, Orange County Sheriff, Ventura County Sheriff and San Diego County Sheriff = near impossible to obtain a carry permit.
Riverside County Sheriff = better chance than the above counties, but you still need a viable "good cause" to get a carry permit.
San Bernardino County Sheriff = will issue for "personal protection", but due to budgetary concerns (county going broke, no money for LE to do background checks for permits), it may take you 2-3 years before you get a permit issued to you.
If you move to Riverside County, expect a 1-2 hour commute to Orange County.
If you move to San Bernardino County expect a 1.5-2.5 hour commute to Orange County.