You aren't the only person that is thinking about moving to France. A lot of people have done it before you. Those people had the same questions as you. So why shouldn't you ask them what answers they found. 

Or maybe you can help other people find their answers. That's why there are a lot of online places to connect you to other people who can help you figure out what you should or shouldn't do. 

Group (link)Description
British ExpatsForum for British people that have moved or are going to move to France.
Facebook: British ExpatsThis is a Facebook page with peoples experiences and questions.
InternationsThis forum connects you with British expats all over France. It includes people who have al ready moved to France but also people that are thinking about moving to France.
ExpatForumThis forum connects people from all over the world we have decided to move to France or are still considering moving to France
Twitter: Brits in France This twitter account provides information for Brits in France. The information is provided by the British Consular Network.
Expat exchangeThis forum gives you advice, information and expat connections about a life in France. The platform is also full of tips and experiences to make your moving experience easier.