Bentley can be a father of puppies but, he is never going to have puppies himself. The female does that. Generally people start with a female, and then search for the very best quality/disposition etc. male for the stud. By paying a stud fee, they can chose among champions etc. to improve the breed.
Is Bentley a St.Bernard mix? Large breeds tend to have very large litters. The puppies grow fast and can eat you out of house and home. plus shots and worming etc. People are generally not interested in puppies without pedigree papers. They also want puppies mostly, at the cute 6 weeks old stage - once they are older they are just gangly like teenagers and you could be stuck with several you can't find homes for. Do you have any plans for what you can do with the leftovers? Friends always want a puppy until they realize how big, and how much it costs to keep a dog properly.