The plates sound right,
And not having the tax sticker is fine too, in a number of cars I have owned I never got the sticker, just the print out, you can keep a copy of the print out in the car and thats good enough if you're ever stopped. At times the stickers are not available so that's not a big deal,
now after asking all these questions you need to tell us what car you're getting and show us some pics ideally