The below may/may not be helpful 😊
(A) Mum and dads health scores. Full Health tests should be done and verified and the breeder should want to show them to you. A 'vet check' is not a health test. If you go on the KC website and look at litters where parents are fully health tested, that'll give you a good idea of what you should expect. If there are no health tests, or not full health tests, walk away. Things like dysplasia, for example, can cost £10s of thousands over a dogs life and limit that dogs life (as well as what you can do with that dog).
(B) Be confident you are happy with that particular litter and the litter is right for you. Not all litters will suit everyone. Some labs are working lines - not many people can handle a working line Labrador. It's like having a duracell bunny on crack. Show lines can still be a hard work, but they're going to be more like a normal Lab (mostly) than a Border Collie.
(C) Easy-Peazy Puppy Squeezy (or whatever it is called) is very good if you're a first time puppy owner.
(D) Labradors are particularly mouthy. You really need to be aware of that. An adult dog is in no way comparable to a retriever puppy. They mouth hard. They don't understand their own strength and that means they can, on occasion, break the skin. So if there are small children in your home, or likely to be around, you need to be aware of that. It won't be done viciously, but it will happen. 10 - 20(ish) weeks will be particularly bad.
(E) Training begins day 1. Lots of people like to fuss puppies, and that's great, but puppies are surprisingly intelligent. I have a litter atm (not yet 7 weeks) and many are already showing signs of being able to head home completely house-trained and/or clean. So, don't wait until puppy training classes. Begin on the day you bring the puppy home - that way, when you do go to puppy training classes, your puppy will not be learning commands for the first time but instead be trying them for the first time in a distracting environment.
(F) Be prepared for the puppy to either sleep in your room, or for you to sleep on the sofa for several weeks. Some advocate leaving a puppy overnight from day one. I would not do that - you could accidentally install severe separation anxiety in the puppy. It's easier to train in good behaviour, through positive reinforcement and association, than it is to manage bad behavioural issues.
I hope that's helpful 😊There's a couple of posters who have young labs ATM, so they might be able to be more specific in their advice.
And absolutely no judgment from me over getting a puppy (although, admittedly as a breeder I would be very hypocritical if I did judge)! Puppies are a clean slate - unless the breeder has really cocked up - and that's what a lot of people need and want.