That’s a very broad topic. Are you focusing on geography/geology or culture/religion or festivals or lifestyle or flora/fauna or history or government? There is so much that could be covered I don’t know what you’re looking for. Maybe pick different topics and just give a general overview on each? Check out the tabs I have on the right hand side of this blog. There are various articles/links that I’ve put in those tabs for ease of access.
I personally would probably talk about all the geological features and landscapes and various trekking and hiking routes etc. Mostly because that’s what I enjoy the most. Or maybe you can mix in culture/religion with the landscapes. Nepalese people in general have various folklores and myths attached to mountains. Some mountains are regarded as homes of certain gods, and others are regarded as gods themselves.
Hope this helps. Good luck!! :)