Regarding your questions on your tree, we recommend contacting a nursery or even a master gardener nearest you to make sure you get the correct information.
Please visit the following website for a list of master gardeners:
University of California Master Gardeners
http://ucanr.org/sites/mastergardener/
Additionally, below are some relevant resources on growing avocados:
California Avocado Commission (CAC) Growers page: http://www.CaliforniaAvocadoGrowers.com
California Avocado Society Growing Avocados http://www.californiaavocadosociety.org/growing.html
For additional grower information you can visit: http://www.avocadosource.com and also
Avocado Variety information http://ucavo.ucr.edu/AvocadoVarieties/VarietyFrame.html#Anchor-47857