STORE COFFEE IN A COOL DARK PLACE
Our coffees have a best before date on the bag, usually they have best before date of about 18 months after production date. Once opened, the coffee will deteriorate rapidly, unless you keep it air tight and in a cool dark place. My advice is to keep it in the bag it came in.  Take out the air, by tightly squeezing the air out, and then keep it tightly wrapped with a rubber band.
 
You can also get resealable bags which have a valve. The advantage with the valve is that, it lets gasses out but does not allow air to enter. The original bags, the coffee comes in, has that valve for that purpose.

 STORING COFFEE IN A REFRIGERATOR ?
In my opinion, storing coffee in the refrigerator is not a good idea, because, it can absorb smells from other food items in the fridge and also give out coffee odour for other food products in the fridge. If you are keeping it in the fridge, make sure that you wrap the airtight bag in more wrappings before you put it in.

STORING COFFEE IN A FREEZER ?
If you are going away for a long period of time, it might be worth putting used beans in an airtight bag, with plenty of wrapping and leaving it in the freezer. Once you take it out, you need to dry it, of any moisture before using it. You can also leave un-opened bags of coffee this way.
 
STORING COFFEE IN A TIN ?
Leaving coffee in tins is not a good idea either, as there is an amount of air in the tin that you cannot take out. It is the air that does most of the damage and therefore the following advice is a good starting point :
 
1.          Buy only what you need for the month or two. If you do not need too much, you can buy them in small pack sizes. Eg 500g instead of 1kg.
2.          Store the unopened or opened coffee in a cook dark place.
3.        Un-used coffee beans should be in a bag [ preferably with a valve], with air squeezed out of the bag and wrapped with a rubber band
4.          Keep as little coffee in the bean hopper as possible
5.         Ground coffee once opened should be used within about 7 days. Always keep it airtight.