Course on kachhua sold in big number when it priced between 300 to 1000 INR. But you are free to decide higher then 1000 also. Keep eyes on length of material/video, number of test you provide and paying capacity of your prospective costumer.
If you are creating your first online course on kachhua, it is edvised that you create at least one or two FREE course first and then publish paid course.