I will write each step here. If you have a better idea, please tell me. Thank you!
I drew up this pattern by taking a few simple measurements of my face. I measured from the bridge of my nose and across just below my cheek bones to create a cross. From that "T" shape, I was able to draw out some of the specifics of the mask from an image that I found using Google Image search. I was specifically concerned with the locations of where the pipes would enter the mask.
I eventually had to correct the height of the straps as they were too low. They had to be raised nearly and inch and the pitch was also adjusted so they could cover my ears.