We've got 2000 grape vines being planted in three weeks time! Having said that, I'm little use to you because they're all wine grapes. I did plant three desert varieties last year but they were chosen pretty randomly.
For soil, they're not particularly fussy. We're on chalk and had our soil analysed so we know we're low on magnesium and will be treating accordingly. Apart from that, they need a decent NPK balance and ideally a slightly alkaline pH (I think anything from 6 to 7.5 is ideal but we're 7.
. One important thing is that their roots need to go deep. We're getting the ground ploughed to 30cm deep but then also having it subsoiled to 70cm deep. So if you're planting in a raised bed, make sure you've dug down into the soil below to break it up a bit as well.
Our vines will be 1.6m apart along the row with 2.4m between rows but if you've got fewer and can feed them more easily, you'd probably get away with a slightly closer spacing. It helps to keep them well mulched with rotted manure each year and generally keep the roots well fed and damp/cool.
The root stock is important as well as the variety. We got expert advice on those - we realised that if we made a mistake with that many, it'd be fairly huge - and ours are coming over from Germany where they're kept in extended dormancy so they can be planted after the last frost here. Have you got a good nursery locally that you could got and talk to about local vines and get suggestions of root stocks? They are best placed to give you local advice on the best root stocks for your climate and soil. So basically I'm no use on that part at all.
We have got a lot of books on grape growing (husband went on a course at Plumpton and came back and bought the book list) so I can suggest some reading if you want - also helps with the pruning.
H