There are a lot of great breeders on here if you don't mind ordering and shipping your animals. They are very knowledgable and will give you all the info that you want and more. Otherwise, you will want to ask several specific questions and the answers you get (or lack there of) will let you know whether they are good or not (most times).
Some questions:
DOB?
Is the snake a good eater?
Is the snake aggressive in nature?
What morph is it?
Breeder's name and supporting info?
Age?
What size/type of food have they been eating?
How are the snakes' bowel movements (I know this one seems odd but it could point to something else wrong)?
What are the snakes' genetics (this one is important if you plan on breeding and some morphs seem more prone to be stargazers ... I haven't experienced this yet so someone else will have to give you the info on it or you could google it

)?
When was the last feeding?
When was the last shed?
Has there been any problems shedding?
Any problems with parasites (mites, etc)?
I have been out of the game (so to speak) for a little while so if I'm wrong on any thing or have left something out please correct me.
