Backyard Fruit Grower is … for you the urban growers here are some links that could help you get started.

Urban Avocado Growing - California Avocado Society
Urban Growers

Urban growers, here are some links that could help you get started in your backyard.

A great place to start is the UC Master Gardener website. The UC Master Gardener Program is a public service and outreach program under the University of California Division of Agriculture and Natural Resources, administered locally by participating UC Cooperative Extension County offices. They are available to answer your growing questions.

You can also make a call to the Master Gardeners Hotline available in some of the counties.
Here are few of them:
Master Gardeners of Los Angeles County Hotline phone: (626) 586-1988
Master Gardeners of Orange County Hotline phone: (949) 809-9760
Master Gardeners of Riverside County Hotline phone: (951) 683-6491 ext. 231
Master Gardeners of San Diego County Hotline phone: (858) 822-6910
Master Gardeners of San Luis Obispo County Hotline phone: (805) 781-5939
Master Gardeners of Ventura County Hotline phone: (805) 645-1455

For General Sources, Production Management and many other links, look at:

More Avocado Resources for the California Backyard Orchard

For Avocados in Orange County look under Master Gardeners Orange County Edible Plants.

Edible Plants > Avocados