What to do next

Hi everyone.
I am british citizen just moved to france with my 4 yrs old daughter and my algerian husband ( he s on schengen visa under directive for 30 days) . Iam also 23 weeks pragnant.
I want to ask how do i register with doctor here!   I know i have to start paying health insurance ....  But dont know what i should do exactly. As i want to sort everything before the time of the birth.  To get help with costs.  Also how do i register my daughter in school ? 
Now we r staying in a freinds' house.  Do we have to show an official address that we r renting at any point now?! . 
And also as we r trying to settle here how my husband can get residence here?!  What we should do? 
Any other information plz tell me. 
Thanks everyone