"I usually have trouble in the entire hand/gripfighting area of wrestling, and I'm not usually able to control my opponents wrists or to gain any good control of his arms. What are some techniques I could use to help set up my opponent."
Here's another tip. Sometimes you can set up a takedown when your opponent has your wrist. My favorite takedown is an arm drag, and I set it up by letting my opponent grab my left wrist with his right hand. He thinks he's on the offensive, so he doesn't expect me to pull his arm in with the wrist that he's holding, then reach across with my right hand on his right triceps and finish the move.