Help with my Psych HW please!?

I have to answer the following question and I have no clue what to do it of. Any one have any ideas they can give me??? Thanks. The best answer gets a vote from me.

Design an experimental conditioning using a “Skinner Box” where you utilize the principles of Operant Conditioning. Explain how the behavior of the animal or human (if it is a really large Skinner box) is shaped or “Operated upon” by the introduction of a reinforcer. Be sure to explain what behavior you want your subject to learn and perform in order to gain the reinforcing stimulus. Then, in step tow of your experimental design, introduce a discriminative stimulus and explain how your subject’s behavior is altered by this additional variable.