A good teacher can have a lifelong impact on their students
Looking back almost fifty years, I can remember what subjects I liked and disliked at school. Most of the subjects I liked was down to the fact that I liked the teacher teaching it.
A child's imagination is a beautiful thing
If you really enjoy your work and genuinely like your students then you'll already have the skill set needed to be able to determine what kids will enjoy while they are learning. My rule of thumb is... if I don't like it, my students won't either.