I am not sure you can breed for coursing. Example: In one litter I had one coursing maniac and one (my dog of course) who wouldn't course to save her life. Go figure! She would chase deer, rabbits, birds and anything that was live, but that plastic bag held zero interest. I think you have to decide on the "type" of dog you want. You've already said you want a ridge, would you be willing to take a dog with an extra crown, or a short ridge? Does the amount of white on the legs matter? Do you want a big heavy boned dog, or would you prefer a smaller boned whippety type? Do you want one with a broad deep muzzle or would you be willing to settle for a more snipey type head. What about the amount of black in the coat? These are all things you need to think about. Your dog will course or he won't. I don't think you can ever be sure. You can, however, train them to like chasing a bag on a line by putting hot dogs and good smelling things in the bag and then running with it across the field while your puppy chases it, but be sure that the puppy gets what's in the bag or he will lose interest very fast!
Caroline