Good post mate, take your time no rush, decide what you want it for, then decide on the type, just rabbits your small cross will do, working whippet, bed/whip, collie/whip, I have an ACDx grey/whip only 21 inch, if you want bigger type for other game ?, then go for a larger, grey/bed, collie/grey or a mix of crosses, do you want to train it to good standard or just somethng to slip and catch ?, pick something with a bit of brain to train.
, Never to old to work a dog or give it a good home, my pup is 12 month, Im pushing 57, had them for years, go for it let us know how you get on, good lu