How can I get ready for teaching?

I am pursuing a bachelor of education degree with the hopes of being a teacher one day. People in my neighbourhood are asking me to give lessons but I am very nervous about doing it because I am afraid that I may teach the wrong thing or I may not be effective enough in my teaching. Can anyone give me some ideas on how to get past this fear and be better prepared? Also can anyone tell me if it is the right thing for not giving lessons in my neighbourhood just yet.