Are you kidding me? I you asked me and i sent you a 45 minute long description down to the very detail of which clear coat spray to use on how to make molds and you are asking again? read it a few times. it will be confusing at first but read and watch those videos i told you about. hope you figure it out.
There are several ways to make molds. Do you have supplies to make your mold?
I'd suggest taking a break to look at a few videos on youtube using 'making masks molds' as your search tags.
or take a look at instructables.com. They have a few videos on making molds as well.
These suggestions will just give you a general idea of what you'll need. People have their own preferance in the materials that they use. Techniques/ materials will differ but after a few videos you'll start to get the idea of what you'd like to try.