I am also a francophile (started at 5 and went through college with it) and understand and enjoy French, so that is what I have chosen to teach as a first foreign language. I know that in our American culture, Spanish may be more practical, but there is probably a reason that God has drawn you toward French. Maybe your children will minister in Canada, Belgium, France, or another French speaking region one day!! So I vote for teaching what you are knowledgable and comfortable teaching, for what it is worth :).
From what I understand of how Charlotte taught foreign language, this is what I do:
K-3: Vocabulary. We learn the names of things, and some basic French phrases on a daily basis. We drill, use flashcards and index card labels, and have a few minutes of conversational French – as in, “Qu’est que c’est? C’est un table, tres bien!”. We learn nouns, numbers, body parts, foods,colors…you get the idea. We also use the Little Pim videos for the youngest kids.
3-4: We use Fluenz French alongside “French in 10 minutes a Day”. And we continue learning conversational French. But we have found that Fluenz is a good transition for students who are not quite ready for….
5+: Rosetta Stone with “French in 10 Minutes a Day”, and conversational French.
This is their basic instruction material, but I also assign some French reading when I feel that some degree of facility in the language has been reached. We start with easy story books in French and continue in difficulty just as we would in learning English.
We also use Pimsleur French in the car, which has helped tremendously!
As with so many things CM, these methods feel very natural, but are incredible effective. My daughter (12yo) is reading a lot of Bronte right now and can translate most of the French on her own. She will end up being a lot better French speaker than her mother!
We also plan on taking some ‘immersion’ trips in the future, and seeking out some of the French speaking members of our community to come over and communicate with the kids. In the end, nothing in language lessons is more important than real life experience.
Obviously, we have made a significant investment in these materials over the years b/c it is important to us that the children learn a foreign language. But most of our software and materials can be used again and again, so we feel it is all right to make room in the budget for it.
We recently met a man from northern China who speaks Chinese, Russian, English, Arabic, and Urdu (sp?). He works as a translator for an export firm in China…amazing and very motivating for us as educators!!