If you are at home and trying to design a Devanagari typeface for the first time, Mota Italic has some useful resources for you!
Devanagari Type Design Resources collection at www.motaitalic.com.
Indic Type Cooker is a nice way to practice lettering before stating to draw your typeface.
Creating a Devanagari Font tutorial in Glyphs can help you figure how to begin with your first font in Glyphs app.
Devanagari Font Testing page, for when you have created your font and want to evaluate the shapes & spacing and test out its features.
Designing Indic typefaces for the first time can seem overwhelming, but once you understand the steps and work towards them, we are sure, you will enjoy the process!