There are some really nice things you can to do to establish your dominance. To ease into a scene, have her sit at your feet and play with her hair, gradually increasing the pressure until you have her head pulled back by her hair and are looking into her eyes. Talk to her in your best "Dom" tone of voice. Tell her she's beautiful, tell her how much you're going to enjoy using her, tell how much she needs you to... Then use the handful of hair you have to pull her onto her hands and knees and 'walk' her into the play area you are using for the moment. If she likes this, it may lead to the wearing of a collar and leash, which offers all sorts of yummy possibilities for control.

Gosh, I just turned myself on.