Plenty of good advice on here, but you need to asses your needs .
The pay roads in France are very expensive,
If you are bringing pets there are a few different options.
we came over via Poole to cherbourgh.
the ferry only takes 4 hours. our dog just stayed in the cab of our van and slept. though you can arrange a visit half way across to see they are ok.
ferry arrived around 1400 and we drove south to Bordeaux , we stayed in a motel as we had allowed a couple of days.
we could have made it to our new home the next day as it is a very straight forward drive, but we decided to overnight at ghandia to get a good nights sleep before unpacking the van the next day.
It was very easy and my wife and el perrro slept all the way.