If you breed a litter, whether you want to be a breeder or not, you are a breeder and responsible for those pups for life. They would not be here if not for you so you need to be ready to keep them all or take them back no matter what happens. You also need to be prepared that by breeding your girl there is a chance that something could go wrong and you could lose her and/or the pups. Make sure you have a good nest egg because bills add up quickly, a c-section will run you around $1000 if necessary and if an emergency, costs can easily be more like $2000 and that isn't including just the routine costs of raising a litter.
Here is the thread about what I went through my girl Rally's second litter, http://www.basenjiforums.com/showthread.php?t=613
Here is the thread about my current singleton,
If you are prepared for all the consequences of a litter and still want to go through with it then you need to do the health testing so you do right by your pups and make sure there are no health issues that may be passed on or may put your girl at risk.
The minimum recommended health tests are:
1. Fanconi DNA test, you can order a kit from OFA, http://www.offa.org
2. OFA hip x-rays, the form for submitting the x-rays in on the OFA website
3. OFA thyroid panel, the form with accepted labs is on the OFA website
4. CERF exam, you will need to find a certified veterinary opthamologist for this. They sometimes hold clinics in conjunction with dog shows for a reduced price, usually around $35.
You need to know why you are breeding the litter and what you hope to accomplish in order to look for a stud dog. Good stud dog owners are particular about allowing their males to be used because those pups are going to reflect back on them also. They are going to want to know your goals, know your placement policies, and will need to be able to verify your girls test results.