Harshita, It's easy to teach on italki, by Skype etc. I would suggest you start by always writing in a good grammatical style. This will encourage students to do the same. So, "How can I become a teacher?" is better than "how can I become a teacher" If YOU forget capitals, question marks, and full stops/periods, then the students will think it's okay for them to forget them too! Some need to pass exams, and they need good examples to follow.

Hi Harshita! Being a teacher on italki it's really easy! You just have to do your teacher application, that you can start here https://www.italki.com/teacher/apply , and wait for italki staff's approval. Then you can immediately start teaching! Have a great day! ;)