
You really have left it too late for this season. No REPUTABLE stud dog ownere would consider allowing their dog to be used on an unknown bitch at such short notice.
Apart from Hip Scoring, Elbow Scoring and eye testing you will need an unbiased opinion as to her quality in order to select the best partner to produce quality puppies with as many of the breeds virtues as is humanly possible. Producing pups with Excellent Health and temperament goes without saying.
To this end it will require studying the pedigree of dog and bitch to not only see if they are compatible in looks and health, but also that their ancestors do not have similar faults and failings.
A good first step would be to join your National breed club, and with Labs the nearest regional one. Here you will learn more about the breed in order to determine if breeding from your bitch is right ofr you, her and the breed. :D