Recommendation Help?

So, I’m incredibly confused about how the entire common app recommendation process works. I’ve invited the teachers who have agreed to write me letters, but I have a few questions: Do they have to fill out some sort of form in addition to the letter, or just the letter? Will the Common App email them about deadlines for the schools I’m applying to? What should I do with my recommender in terms of follow up? Thank you! I’m already so stressed about college and my senior year hasn’t even begun yet :))