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There are quite a few choices, here, as they make great container plants! You can choose a cultivar that sounds good to you, from research.

Here is an article that will help:

https://www.gardeningknowhow.com/edible/fruits/grapes/container-grown-grapes.htm

As far as pricing- That will depend on where you purchase. You will likely get a better price from purchasing locally, but there are many vendors online. You can check places like Amazon, Etsy, or Ebay.

Here's an article that should help:

https://www.gardeningknowhow.com/edible/fruits/grapes/prune-grape-vine.htm

Typically, the exact care they receive will depend on the exact cultivar that the grapes are. Without knowing this your experience will be trial and error, mostly.

Here is an article that will give you a general idea of how to care for grapes:

https://www.gardeningknowhow.com/edible/fruits/grapes/growing-grapevines.htm

This article will help you to prune them:

https://www.gardeningknowhow.com/edible/fruits/grapes/prune-grape-vine.htm

If the seeds were few, then this is completely normal. If there were many seeds, then it could be that the plant was mis-labeled.

Here is an article that will help you with the care of grapes:

https://www.gardeningknowhow.com/edible/fruits/grapes/growing-grapevines.htm

Unfortunately, weed killers that will kill off the thorn vines will likely kill the grapes too. You will have to cut them before they send out flowers or seeds, and also dig up the roots completely every time you see the first hint of a plant coming up. Try mulching well to prevent new ones from growing.

No, no! Don't do that! This is the year that you have been waiting for. 3rd year grapes are ideal. After this, you will be pruning some of the older cane back for rejuvenation.

Here are some articles that will help:

https://www.gardeningknowhow.com/edible/fruits/grapes