rookie.

i am new to gardening. we moved into a house with 9 acres in zone 21 or 20 not sure. we have 3 macadamia nut trees a fruit tree that we have no idea of what kind. a blood orange tree, lemon tree, 2 other trees we were told they are avocado but from the fruit it is starting to show does not look like the avocado trees in the area. i am looking for info on taking care of the trees. there has been no trimming, pruning or any care for the trees in 18 years. i am amazed they are alive. but they are the mac trees are starting to produce nuts after i raked the area around them gave them some mulch trimmed some of the deadwood on them. we have alot of coastel live oaks and manzanita on the property also. i am in nourth san diego county california. all help is greatly appreciated. i can take pics if needed.