reccomend1.Find a picture you want to use.
2. Using an image editing program take all the color out of the picture(desaturate), make it as close to completely black and white as you can(mess around with the levels).
4. Cut out the black/gray with something, x-acto knives work best.
and that’s it.
Those are the VERY basics of making a stencil, theres more to it if you want to make more complex ones but these are the basics.