Do you want to be a primary or high school teacher? Are you good at languages, maths, science, literature or history? You have to go to university first and major in the subjects you would like to teach. Most schools require a Masters degree in your subject areas. Then you have to obtain a diploma of teaching where you need to complete a certain amount of teaching practice. Later you can apply to a school for a job. Perhaps it is slightly different in your country. Why not google your question? If you mean being an Italki teacher go down to the bottom of this page, click onto Language Teachers and then click onto Apply to be a language teacher.Good luck.

You should have a great patience :)