These are oil-based and faster drying than acrylics. Since you must wait for the paint to dry to lift off the stencil, quick drying and clarity of color make Japan paints the preference of pros. If not using spray paint, you will need stencil brushes. These look like shaving brushes with straight, evenly-trimmed bristles. The pliability of black China boar's bristles will give you the most control.
Acrylic paints are water-based and, therefore, easy to clean up.
A four-ounce jar of acrylic paint is all you will need for one room. If using more than one color, you may want to buy artist's acrylics in tubes. If not using spray paint, you will need stencil brushes. These look like shaving brushes with straight, evenly-trimmed bristles. The pliability of black China boar's bristles will give you the most control.