bought a grape vine - what now?

Plant it in the sunniest place you have, even if you have to dig up your granny to locate it.

Learn about your variety (low, medium or high vigor) and its natural growth habit (trellis or hedge) and try to emulate this habit as closely as possible.

Plant it 6-8" deep and 6-8" from the wall, then mulch heavily with well-rotted manure.

Prune back 90% of the previous years growth EVERY YEAR WITHOUT FAIL.

Ensure a reliable water supply until the fruit is ripe then reduce it.

If you plant anything within 8 feet of it, make sure they are low demand plants like oregano, thyme, etc as opposed to things like lettuce or cucumber that will drink it dry.

Once established, giving its foliage a vigourous (not too high-pressured) spray of water every now and again in the early morning or evening deters many bugs from getting a foothold, especially red spider mite.

These are just general guidelines and it is really down to you to learn about your specific variety.

Hope this helps, Woodpile