I'd pick two best branches and train them vertical .. Then trim them off when they get to the top wire. Let one go each way. The mid wire will be for trunck support only. I would not let it fruit until next year.

Thanks for the quick help, Ben. I understand what you said about picking the best two branches and training them vertically but what do I need to trim when they get to the top wire? Do you mean lets the shoots from those branches grow along the top wire while I trim off the tip of the original branches that I trained so it will stop its vertical growth?

Also, with two branches being trained upwards, will I still end up with one large 'trunk' that I normally see on grapevines?

Thanks again for the help.

You're late getting this off to the best start. But given where you're at train one shoot up the stake, probably that one by the stake. Cut off everything else. When the shoot approaches the top wire pinch out the tip. Pinching will cause at least two side buds to grow. Train one of those shoots each way on the wire. These two shoots will bear fruit next year.

The plant is too small to bear this year and that would require keeping all shoots present now. At most you'd get a couple clusters.

Thanks. That shoot already on the stake doesn't seem to want to grow much for whatever reason. Last year it put out around 2 - 3 feet of growth on the two longest branches (one broke over the winter) but that one that attached itself to the pole just sorta puts out a few leaves and then stalls out. Maybe it will take off this year.

Too bad about having to wait until next year but luckily a wild grapevine found its way onto the telephone pole in my yard and its loaded with clusters. Maybe The birds will save me some?

Thanks again.