@TrueBloodNet for support i use 6' posts with a cross piece and string baling wire along the ends.
Soil preparation depends. More water equals more grapes generally.
Big pruning in the off season
I do no pesticides or fertilizer other than composted stuff. Beetles love grapes and chickens love beetles.
How do you feel about chickens?
@TrueBloodNet oh it may take 3 years to really get them established.
@TrueBloodNet 5' is fine too. Want to keep the fruit off the ground and at easy height for picking. The vines can grow 5 feet in a season - forgot to mention that every so often go loop them onto the wire to keep them off the ground.