You can find the article on Teaching Center at Udemy to start working with your own course.
The link is here:
As you are already registerred at Udemy. So
1- Login to Udemy
2. Under your profile menu; click Instructor Dashboard
3. Then start creating your own course
I suggest you to plan the course and follow the checklist for A/V, Video Editing software and then upload the course. So read the articles as mentioned on above link.