Hi,
Driving in France is easy. Do do some searches on the internet. in towns the give way to traffic from the right keeps you on you toes. the drive alive web site is good do a google. (driving in france) don't puch your self too much on day 1 in france. get used to driving on the right we try to do no more than 2 hours.
Via michelin route planner is great as it gives you the tolls for the motorways.
If you can afford it invest in a decent sat nav. One you can pre load itinery journeys. I have tom tom. get the maps of europe not just major roads.
Holiday inn express in poole is good as you get continental breakfast includeded in the price. £50 for room for a night. not sure what time they start breakfast service.
As for meals etc in france advice above has is right. it is cheaper to eat inside than on the terrace in a lot of cases. Cheap lunches are simple a baguette and some cheese ham salad etc from the supermarket. we pack a few picnic bits. plastic plates wetones platic glasses a knife etc.
As others have said treat the drive as part of the journey. we always leave early in the morning and restrict our selves to 5 hrs ish a day and then we spend time around where we stay for the night.
Logis de france hotels can also be good in addition to the Ibis, B&B chain, ETAP Suite hotels etc.
hope it helps
Adrian