All the paint shown is from Tulip - fabric paint - washable.
Some of the stencils are from Tulip, others from local stationers.
If your stencils are not 'tacky' sticky ones then put a dab of glue on - but don't leave them on for long.
Position:
On 1 shirt I put 2 stars to cover a stain! but normally I think they look good on a sleeve or near a hem at the bottom.
Have fun!