OK. So get as many certifications as you can.
As a first year teacher, you may not get what you want; they’ll hire based on what they need, not on what you want to teach. And you may end up with a combination of things-- two Latin classes, one Spanish and two French. Again, they’re not going to work around your preferences; they’ll hire based on what they need for the upcoming school year.
But two, even three, different preps isn’t the end of the world; it’s pretty typical. It breaks up the day a little if you’re not repeating the same lesson 5 times a day.