bigbitch
How much is the pup?
What age will it be leaving its mother?
What feeding regeime will you follow?
Do you know how much its vaccinations will cost?
How much is dog insurance? Will the breeder do the first lot of vaccinations, does the dog come with six weeks free insurance?
Have you met the mother at all? 
What about worming? will you do that every month for the first six months?
What about having the dog castrated or speyed, how much will this cost.
What will you do to introduce bite inhibition, all dogs puppy bite, its fucking painful, when you are 2 year old can you imagine being bitten over and over by a mad staff puppy? How are you going to get over this?
Will you crate train your dog?
How will you toilet train it?
How much exercise will it get?
How long is the maximum recommended time to leave an dog alone for?
What will you feed it on? A decent expensive diet or rocket fuel from the supermarket?
How much per week do you anticipate spending on your dog food etc?
Flea treatment? How much per month?
If you decide you cant cope, your dog will be most likely put to sleep, can you live with that?