It's pretty simple to do...You can google the idea and find TONS of templates. Decide what kind of treat you want to give. I gave a threesome of chocolate chip cookies that I baked. I was going to give some of the caramel apples we made, but decided to keep those for myself. :) Erin gave a bag of mixed candy...it's up to you. Put it in a bag or container, and attach the printed "boo" and poem. It's also a good idea to include extra copies of the poem/boo so that the next person can put them in the treats that they make. This will (hopefully) ensure that the ball gets rolling, and people get to boo-ing. Put the treat packages on someone's doorstep, or in my case, teacher's desk anonymously...watch the magic happen.
This is the poem. You can go HERE to down load the templates.