The most common are 1st and 3rd person. 1st person is when you tell a story from your point of view, using the pronouns "I or we." And 3rd person is from an outside point of view, using the pronouns "he, she, and they." 2nd person isn't very common because it uses the pronoun "you," and makes the audience a character in the story. Hope this helps!
I’m a little confused what exactly is your question?
Be patient. That is one of the most important things. Treat the kids with respect (not to the point of being a pushover- you are the adult ofc) and they will treat you with respect most of the time. Think back to when you were in that grade and think of the things you hated doing, because most likely those kids now won’t like them either. Try to incorporate fun things into your lessons, no one is going to learn things in a class that makes you want to fall asleep. You probably already know all these things, but this is coming from a current student :)