Follow the directions that come from the supplier. A lot of the way you plant them depends on what type of vine you bought, such as potted or bare root, etc. In general you want a fairly deep hole and wide enough to accomodate the roots when spread out a bit. For bareroot ones, dig the hole a bit bigger than needed and then put a slight mound of soil in the center. Place the vine on top of the mound so it sprads the roots and they slope away from the center a bit. Backfill the hole and compress the soil slightly leaving a slight depression that will hold water when you water the vine.
Don't put fertilizer in the hole when you plant.
Good luck!
