@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
Traps, yep, or just knock them into a bag and give them to your local poultry friends. We get a swarm of Japanese beetles and while it's dramatic, they don't really do a lot of damage.