Not sure what type of Grind level you need, here is a Info-graphic to help you.
How we brew our coffee and how long the water in in contact with the coffee grounds will determine the specific size of grind that you will need. I have added a chart below to help you decide on what type of grind you will need. Too fine of a grind and you will over extract the coffee producing a very bitter cup, too coarse of a grind will under extract the coffee producing a cup that is very sour ad salty. So no mater how great the coffee you buy is, not using the correct grind for the way you brew your coffee will not allow you to have a great cup. Also the best cup will come from whole beans that you grind yourself just prior to brewing the coffee.