hi, i was wondering if anybody knows how many pups a  staffy has? i want to breed mine but am unsure of how many pups they have!

any amount is possible up to 9 , but the average is 5.

I've know of 0-11 pups! Although the average is 5.
Is your bitch eye tested? Good stud dog owners insist on it.

Before you go any further you need to do some reading, breeding dogs is not always that simple. 
The book everyone swears by is The Book of the Bitch
I would also recommend The Whelping and Rearing of Puppies by Muriel Lee. 

Make sure you have all the relevant health tests done on your bitch and that the dog is health tested too.