Are you mostly planning to stick to main world languages? 3 months seems like a long time for each language if you don't plan on actually learning it. If I were just doing a survey, I'd think maybe 3 weeks per language? Otherwise what is the point? You would only cover 3 languages in a year out of the hundreds and thousands that exist.
I plan to do something like this when things settle down. We do it a bit but not formally. I'm a bit of a language study geek and I like to talk to my kids about the politics of minority languages, show examples of the different speech sounds used around the world (including clicks which are always awesome), and teach the (debatable) difference between dialect and separate language. I am hoping to include lists of minority languages with our study of geography and cover the politics and writing systems more formally some time..
Thanks to and Wikipedia, you will have tons of resources available.
Edit: Sorry I don't know if I understood your first post, and even after re-reading I am unclear. You want to learn about 12-15 languages and THEN pick one to study for real? That makes more sense than what I was thinking but forgive me if I have it wrong both times.
Edited by CadenceSophia, 26 December 2016 - 04:12 AM.