Okay. What is it going to be: form-focused or communicative or a combination of both? Back up your thoughts with some of the studies in LS Ch. 6.
Based on the research I have read, here in Lightbown and Spada and several other sources, and in my own personal experiences as a language learner and a language teacher, the best approach would have to be somewhere in the middle, combining plenty of comprehensible input (go, Krashen) in the students' Zone of Proximal Development (shout to Vygotsky) with plenty of opportunities to speak in meaningful interactions. Grammar/structure has to be addressed as well, and it seems most effective to introduce this explicitly, then have students practice in meaning-based, communicative tasks. My favorite book that supports this is James F. Lee & Bill Van Patten (1995). Making Communicative Language Teaching Happen, which focuses on providing opportunities for both structured input and structured output, with concrete examples we can use to create. Lee and Van Patten's book is excellent in terms of classroom applications that can be immediately implemented. In this chapter of L&S, studies 31, 35, 37 and 38 lend further credibility to the idea of varying instruction and using a combination approach.