Astrophysics concepts help required

I need an expert in Astrophysics to help prepare detailed notes to explain to school kids about basic calculations of ellipse, conic sections, spheres, keplers laws, newtons laws, orbit determination, orbital launch of satellite, and mechanics from layman perspective.

I need notes to be self explanatory, like why we consider r2 in newtons laws, T3 in keplers laws and so on.