Dear Teena,

for CP-MAS at natural abundance (no isotope labels) you will need several mg's (we use typcially 80mg of powder) of your "film" stuffed into a small NMR container (100 ul) - less is needed if you can have 13C or 15N labelled material.

Alternatively there are methods using stacks of films on thin glass-plates, but to my remembering they all need isotope labeled material (https://rmnmc.chimie.unistra.fr/)

I hope this is of help

Alfred