The rescue charity who you adopted through should be able to give you a picture of what your dog likes doing, his training, routine, food preferences etc. As much as possible, stick to this in the first few days to minimise the stress of a new home.
Don't make too much fuss (tempting though it is!) of him in the first few days, just go about your typical daily routine, gently and cheerfully with him. I'd strongly recommend signing up for local classes - basic obedience, something like KC good citizen scheme is great fun, and you will have a better behaved dog, who is a pleasure to have around. It will also greatly increase the bond between you.
Before he arrives, sort out with DH and DC the agreed boundaries/rules about interaction with the dog - consistency is absolutely vital from Day 1. Make sure DC understand doggy manners - no grabbing, poking, pulling, not to disturb dog when sleeping or eating. Depending on how/where your DC eat, think about making sure dog does not have access to abandoned bowls of cereals, etc - this is particularly important as items such as chocolate and grapes/raisins are poisonous to dogs and are frequently found in things like biscuits, cereals, cakes etc. Kitchen - Labs are notorious dustbins - make sure bin is secure and get in the habit of not leaving foodstuffs anywhere accessible.
Practical questions - ensure you have insurance from Day 1 - vital. Make sure dog is chipped and details are up to date, and get tag made for collar. Ensure garden is secure, and that all members of family are briefed on importance of keeping doors shut and entrances secure, especiallly in the early days. Register with local vet, and as mentioned, find local training classes. Your car - how/where will dog travel safely? A number of options and you may need to consider this before dog arrives, depending on your preference and the type of vehicle you own. Get vet number and local dog warden programmed into your mobile, and ensure you have a good set of pics and a detailed description on your phone in case you ever lose him and need to provide a description quickly.
He will probably be OK if you change his name, though obviously this will take a little longer to accustom him to it.
There's a very good Labrador Forum which you will also find very useful - I know Daisy frequently recommends it.
Don't forget plenty of poo bags, collar, lead (not an extending one), brush, bed, food, bowls for water and food, treats for training.
Good luck!! 
Oh, and we want LOTS of pics. 