For a better understanding, you have to recognize the problems of the students. Different students carry different capability and you have to recognize their particular work level. The level of difficulty varies from subject to subject and question to question, a capable teacher has to find those levels of difficulty and solve it for their respective students. Having the knowledge of the difficulty level will help you make a better plan for the students. It will also help in the long run process of tutoring and will make sure that the students don't lose their interest.
The best way of going with this is thoroughly understanding the topic yourself. Sit down and learn the topic yourself, divide the problem into parts and create an instructional strategy. With this set of instruction, it will be easy to deliver the points quickly. Those tutors who directly go to the students with a new set of topics, find it difficult to come with a solution.
Whatever teaching approach you come up with, always keep in mind that before you sit in front of the system to teach the students, first come up with a detailed idea of how you are going to carry forward the process. Having a thorough knowledge of the topic and student's capability will help you complete the teaching session in a better way.
So, define your process and take a step toward successful online tutoring career.