Take a look at this page on Service Public: Acquisition de la nationalitÚ franšaise - Service-public.fr
There are three dossiers under the heading NationalitÚ Franšaise par mariage and those outline all the requirements. Last time I checked, you needed 5 years of marriage to a French national living outside of France.
Never having been to France might be a slight impediment. Get your French spouse to take you and the kids for a holiday in France at least. It will look much better on your application if you can comment on how much you like the French countryside or French cuisine or whatever.