For an english bulldog, as an adult, use a rolled leather collar on him, that will sit comfortably between his wrinkles and skin folds, as for walking, EB's often have a small trachea, and putting added stress on the throat while pulling during a walk may irritate it, and cause him to cough. Many EB owners use nylon harnesses if their dog can not handle the pressure of the collar on his throat. If he ends up being a dog that pulls hard on the lead, the use a harness in conjunction with a prong or martingale type collar, that puts even pressure on his neck, give him corrections with that, but you will still be able to control him with the harness if he becomes distressed in his breathing while out on a walk.
To begin collar training, use a lighweight nylon collar and lead, but watch for signs of distress on his trachea while walking.
Good luck with your baby, and cant wait to meet him. 8)