Hi @Waheeda Aamir welcome to our community, we're so happy to have you!
Are you trying to upload your ebook directly on the Udemy marketplace? If so, unfortunately, this wouldn't be possible. To upload an ebook you would first need to have either a free or paid Udemy course.
Courses must have at least 30 minutes of video content and at least 5 lectures or learning modules to be published on the platform.
An option is for you to create a free course with our minimum quality standards hereand share the ebook attached as a resource. Here's a guide on how to add resources to lectures. You can also use the Bonus Lecture of the course to promote your ebook.