I want to teach the basics accounting principles before going into sage properly.

[Ctutors_2020]

My course is to teach SAGE Accounting and MATHEMATICS from scratch.

So I want to know whether I can teach the basic accounting principles that will help students to understand how to make  posts in SAGE.

Secondly can I be working both SAGE and MATHEMATICS simultaneously toward publishing them as my first course.

I m a new instructor in Udemy,

Thanks.

[Gokul]

Yes, you can do that. However, you will not be able to mention your other courses in any course in all lectures except for the bonus lecture. 

[Ctutors_2020]

For a video that will take up to 15 hour to complete a course. How do I go about it.

Will it be taught once or what.

[Gokul]

I couldn't understand your question. 

[Ctutors_2020]

What is the minimum time for each video sent to Udemy.

Can you teach to any length you want.

[CarstenMuessig]

See https://community.udemy.com/t5/First-time-Course-Creation/Minimum-video-length-is-1-31s-enough/td-p/...