Hi Roxanne -
Here is a link to a pattern:
mask pattern
You should probably double-check with whoever you are making these for before doing anything to make sure that these meet their needs. These do NOT protect anyone from COVID-91, but are useful in other areas where they need less protective masks, which are unavailable. There is a group on Facebook called "Relief Crafters of America" that is organizing an effort to make the second mask at this link (the one with the insert) for specific groups that are in need of the masks. If you are looking for a place to contribute your efforts, this is a good place to go. They are not only organizing getting needs met, but are also working with the organizations to make sure that they don't get inundated with more items than they can handle, like happened to some places in Australia.
Nancy