I'm looking for some advice on a newly planted grape vine (planted two months ago from a 15-20 gallon starter). It has a few branches, some woodier than others, coming from the root (see photos). Do I keep all or prune back to only the one or two hardiest?

It's also a prolific grower and is taking off in all directions, but I'd like to give it support along the fence it's growing against. Any recommendations for a support or trellis idea?

Many thanks!