My suggestions for looking at litters of puppies and than deciding on your puppy is First thing :
1.Tell the Breeder you only want to see the SEX of the puppy that you have decided on. So if you decided on a female ask them to please only have the females out..
2. Watch the puppies interact with each other, this way you can tell the shy from the fiesty
3. Sit down on the floor with the puppies and see who comes to you do not pick any up until they come to you
4. Do not rush into it, make sure the breeder realizes that you are going to take your time.
5. If you have your family with you than only allow one adult to sit down with the puppies , no children
6. If you decide that you dont like the attitude or color of a certain puppy ask the breeder to remove that one
7. Make sure that each puppy looks healthy, if one does not , than look otherwise
8. Once you have decided on your puppy and you cant take it home ask how they will mark the puppy
9. Than make sure you sign a deposit contract or a contract
10. Make sure you get business cards or something that shows that your puppy will be there when ready to pick up.