[@DesperatePerson]

 It would depend on how descriptive you would like to be. On a bow there is a grip which is about centrally located on the shaft of the bow. You would hold this with your non-dominant hand. The arrow would be "notched" onto the string in a small slit that is cut in the shaft of the arrow just behind fletching, which is a fancy word for the feathering. The shaft of the arrow is balanced against the thumb of the non-dominant hand while it clutches the bow. The arrow is generally held with the thumb, forefinger, and middle finger just behind the fletching and pulled back. Typically, the arm is raised to the height of the ear and the user tilts back to add distance to the shot. Regardless of distance the dominant hand is drawn back to the ear before being fired. I would suggest goggling for imagery or searching for a youtube video to get a better understanding. 


Edit: If you have questions about melee combat please feel free to inquire about them in this thread or you can send me a personal message (PM) and we can discuss them there.

Edit @2: I also disagree with the above comment that one should refrain from describing the use of weaponry in such detail. Quite frankly, if it is necessary to the story for any reason I would certainly include it. Perhaps your hand position causes the arrow to miss its mark. But you might go into detail not as filler but as introduction to the weapon describing the bow or arrows as you go because they are special to the character. There are a number of situations where I can surmise describing such thins in detail would be a good idea.