Mango seeds
are easy to germinate. The trees are self-fertile, so you only need one. There are two races of trees: Indian - which hate humidity and develop mildew easily, and Philippine which are hardier in California. You are likely to get fruit in 8 to 10 years from a seedling. It is likely to taste poor in comparison to the cheap mangos available at Trader Joe's (a grocery chain in the U.S.). You might find the following interesting reading -- although the list of varieties is about 10 years out of date:
MANGO Fruit Facts