Welcome and congrats on the new addition. Keep the pup on the breeders food for at least the first year. Pro Plan is good food, and I'm sure your breeder uses it because their dogs do well on it. There are a lot of member of this board who use Pro Plan.
If you get a chance to visit the pups a week or so before you pick yours up, take a couple towels and have the breeder put them in with the pups. You'll be able to take them home with you and the pup, and he will have something with a scent he knows. I can tell you from recent experience (2 pups over the past 3 years) that those first couple weeks can be a bit rough. Biting, house training, crate training, chewing everything in sight. You'll swear you have a possessed demon in your house. Patience is the key to getting though this period, and soon enough, a routine will be established and things will start to get easier. Sign up for puppy classes as soon as the pup has had all shots. It will get you started on the right track.
Raising a Lab pup is a journey, not a destination. You are going to laugh and cry along the way, and with a lot of love, patience and effort, you and your pup will have an amazing journey together.