Content for a learn Hindi alphabet app

I am developing an app for learning the Hindi alphabet, targeted at foreign adult learners. The app is going to be divided into sections that explain parts of the alphabet, one aspect at a time. These sections should be about a 30 second-2 minute read each and in total there will be about 20-25 such sections. Two sections have already been written, giving an idea of what kind of content I am expecting. The rest of the sections have been roughly outlined content-wise. The task is thus to write the section content for explaining the concepts in a clear and easily understandable way. Besides good and concise writing skills, I also expect someone who is able to read Hindi (Devanagari) to ensure that the content is correct.