spitfire wrote:what is the difference between "bittering/finishing" hops ?         Do you add the hops at different times or what ?      Are they talking about taste ?
this is why I suggested you read a book or at least the first part of a homebrewing book, go to the library and see what they have.
Bittering hops go into the boil after Hotbreak and should be boiled for 60 minutes.
Finishing hops....ur lets call them what they are,
Flavor Hops are added with 20 minutes left in the boil or 15 min. or 10 min or 5 min or all of the above, at each time they will add a different flavor component.
Aroma Hops are added at Flameout (when you remove the brewpot from the heat), these add mostly smell or aroma to your brew, which the olfactory glands contribute to taste, so it is more important than just smell.  there are about 100 different types of hops and they will each give you a different taste profile, following a recipe is important if you are targeting a desired style of beer, once you've brewed 20 or so batches and do some reading, you will be able to formulate your own recipes, there are math formulas that you will need to use to figure out how many ounces of Hops you need at what time for a certain desired effect.  
So to conclude, for your first attempt at a homebrew, follow a recipe.  Or at least don't use too much Hops, it will make you Beer bitter.