Hello! I find jotting down ideas and create a list of all the things I want to include helpful first. Thing about all the important questions like what makes you want to become a teacher? How has your experiences shaped this? What interests you about teaching. What extracurriculars/ super cirriculars has helped you gain experience/ essential skills that's required for teaching. Also thinking from the admissions perspective helps. Like they need to see motivation reasons in there (preferably not common and specific to your experiences), they also need to see that you know what skills a teacher needs and that you have some of them already through any experiences you've done. It doesn't have to be anything too big just reflect deeply on things you've already done and you'll find you have so many skills you didn't even realise you had.