Growing pips, stones and seeds from random fruit & veg.

A long time ago I tried to grow plants from various fruit and veg that were bought for eating. I remember trying citrus fruit, avocado, peach, blueberries, pomegranate and dates - some of which were successful. 
Winter is coming and I need a new Challenge. How about you? 
I have some citrus fruit, pomegranate and avocados to start. Any hints and tips are, of course, welcome.