
The best person to hold your hand so to speak would be the bitches breeder, and the stud dog owner. they should both have years of experience and knowledge of their lines, and so be able to advise you about likely length of gestation, likely behaviour and all other things Staffie!
I am sure board members will be able to offer some ideas.
You can buy disposable whelping boxes, if you look in the classified columns of Dog Magazines.
You will need to prepare quite a few things.
Try a google search, and obtain a book called 'The book of the Bitch' this has so much valuable advice and information. I still refer to it every time I have a litter, and have had (well 3 of my bitches between them) 7 litters over the years!