1. Photo. This is probably the most important thing you will need. You will probably need a few photos. Once you start editing it, you will find that some of your photos just don't convert well into a stencil.
2. A computer with photo editing software such as photoshop or gimp? I've never used gimp, but it's free so give it a try and let me know how it works for you.
3. Thin cardboard box (shirt boxes from a store work great) or 2 clear acetate sheets. These will be your stencils so you want to make sure they are thick enough to handle paint, but not too thick that it takes a week to cut out.
4. Two contrast colors of paint. I recommend acrylic. It's fast drying and cleans up easily with soap and water.
5. Exacto, or similar cutting tool. Also, get a cutting mat so you don't destroy your kitchen table.
6. Sponge or stencil brush. Either will work
7. Canvas board. These come in 8x10 which will work great. These can be found at any art supply store. Even Walmart carries them in the art supply aisle.
8. Spray adhesive. Do not use glue sticks or pva glue. It will leave gaps and make cutting the stencil very difficult.
Step 1: Edit Photo
Step 2: Print Stencil
Step 3: Glue and Cut
Step 4: Paint
For mine, I chose Medium Magenta. Lightly dab the paint onto the open area of the stencil. With stencils, less is best, so dab excess paint onto a rag every time you dip your sponge/brush. Big globs of paint will seep under the stencil and will come out as smudges on the finished product. Remove stencil from canvas as soon as painting is complete. Don't wait for the paint to dry.
After your paint has dried, can be sped up with the help of a blowdryer, adhere your detail stencil the same way you did for the outline stencil, and repeat the painting steps with a good contrast color. I chose Mars Black.