It is a marathon, in the long run it can be helpful. But, only one course is not enough. You'll need to publish more than one courses if you want this income stream to become a part of your income portfolio mix.
I believe the barrier of entry is lower for developing countries like Pakistan, we don't need a lot of equipment and our expenditures are lower as compared to U.S based instructors.
You can call me on Whatsapp sometime if you need more information, I'll share my number if need be.