Look at the sire if you can. Look at the dam if you can. If you can't go and watch them and get to know them, go by what they have accomplished title wise.
Realize that some of the pups will favor the sire, some the dam. Be sure you like what you see in both of them.
Know about the health clearances and be sure the parents have them.
If you want a pet, hunting companion and hunt test dog a lot a litters will fill your needs. As someone else said it's good to wait for a litter to come along. On the other hand if you get a pup sooner you can enjoy this one, learn about training it while you wait for the next litter. Everything comes from what's in the dog but that must be nurtured and polished for you to get the best final outcome from the dog. Look at your next pup as a learning experience to get better results from your next pup and the next...