It all depends. What are you looking for?? FT? HT? Hunting dog? Are there any particular sires, bitches that you like? Any particular lines? How much are you willing to spend? The list could go on and on.
Of course clearances are a must.
Decide on what you are looking for and go from there to narrow down your choices.
Gather as much info as possible to make an intelligent decision. After picking out a couple breedings you like. It's a matter of which litter best fits your wants and needs. Talk to the breeder and talk to the forum with questions on good up n' coming breedings.
DO YOUR HOMEWORK -- DO YOUR HOMEWORK -- DO YOUR HOMEWORK
As previously posted, learn all you can about any litter you're interested in. Check pedigrees, clearances; guarantee; try to see both parents in action; try to get to see litter; talk to breeder (a good one will want to talk to you). There is a pup out there for you!!!!