Every  teacher  should  have his or her approach in teaching of foreign learning. Every learner is unique. Every teacher is unique. Every learner-teacher relationship is unique, and every context is unique. You can build a theory based on principles of second language learning and teaching. And it can help you formulate your  own  approach in teaching. I think for your approach's successfulness you must use new useful methods, new technology, may be language games and so on. I will try to create my own  effective approach!!!