Hi @Gowri2211 , welcome to the instructor community! Becoming an instructor on Udemy is as easy as creating a course and publishing it!
Our minimum requirements for a course is that it contain at least 30 minutes of video content contained within at least 5 lectures.
The best place to start is in the Teaching Center. In addition, here are some great resources regarding course creation:
Course Quality Checklist
How to Become an Instructor: FAQ
Wistia Course Creation Compilation