How to be licensed as a PHN in California

HI, I am an RN in Oregon and would like to transfer to California. I am not sure if I can have my oregon license endorsed to california, or should I still take their NCLEX exam?
And I am also interested in pursuing my Public Health Nursing degree but I do not know how to be accredited as a PHN in california.
If anybody could give me some enlightenment on this concern. I would highly appreciate it.