Get a brass hook or Ace arrow roller straightner from 3RiversArchery or KustomKing or some other vender, I aslo have a arrow straigtner made out of part of a antler tine. Look down the arrow with the point in your hand, rotate, flex, etc to determine where the bend is. Rotate until the bend is up, hold the point in your hand and put the nock on your shoulder or chest. Take the bass hook and move back and forth over the up part of the bend, May have to do several times to get the whole arrow straight.
With the Ace roller, do the same to determine where the bend is, place arrow on flat surface with the bend up, roll the Ace roller up and down the shaft on the up part and again you may have to rotate and continue to check as you go.
Both systems work,takes a little knack and practice, but you can get the arrow pretty darn straight and shooting wood arrows is sooo much fun!