Note that you want to store your avocados at room temperature until they are ripe. They are ripe when the flesh is firm but has a slight "give" to it. If your avocado is at the right ripeness for eating but you aren't ready to eat it, then store it in the refrigerator. Storage time is not indefinite though. Try to eat it within 5 to 10 days but that's a ballpark estimate. It varies depending on the avocado.
If avocado is new to you, give it a try. It's wonderful on salad, on a burger (just sliced), this corn salad or on top of rice and beans. Google avocado recipes and you'll find quite a variety of dishes you can make. Do remember that it is high fat (although much less than extracted oils) so don't go overboard. It's a great way to cut out other not so healthy fats from your diet. Enjoy. :)