I think the best tip for cooking a good steak is to allow plenty of time for the meat to marinade. Over night is ideal, but in a bind, a few hours will work. My favorite marinade is made of salt, pepper, garlic, and worcestershire sauce. Combine the ingredients in a bag with the steak, then place in the fridge. When you are ready to cook, sear the steak at a high temperature, then reduce the heat to cook the meat properly.