As many as the person can fit into that cage. Puppy mills are horrible places for dogs to live. They are illegal and any information on puppy mills should be directed you your local SCPA, Animal Services, or police station. It is considered animal abuse.
5 puppies are in the basket
It is different with each dog. Ask a vet, or an experianced breeder.
i believe 7
i have know idea
i think 1 at a time
Most chain-pet stores that sell puppies get their dogs from puppy mills. Many petstores (excluding animal shelters, of course) get their dogs from puppy mills.
1 to 12 kittens
From the information I've read, and seen, yes, all puppies are born with blue eyes. Many have tints of different colors though. The blue in a puppy's eyes can be different shades-many are blueish-grey.
A typical puppy mill can house from 500 to over 100,000 puppies at one time. It all depends on the size of the operation, really.
Puppy mills do not focus on the welfare of their dogs or puppies but rather focus on profits. Many of the puppies purchased from puppy mills have not been treated well and the validity of their pureness of breed is not guaranteed.
A puppy is a puppy; there are no different "kinds" of puppies -- it is a description of any canine that is immature, usually prior to one year of age.
There are many websites available online where you can find puppy genitalia pictures, which will help you distinguish male puppy from female puppy.