RTI Action Network Discussion Boards

I've looked at the links you mentioned, and I know the same little bit that I knew before.  My question is what will it look like for me?  I understand that our model will use 3 tiers and that students will be assessed regularly to determine the appropriate tier for their skill levels.  What I don't understand is what I will be doing to help them.  I have some ideas of what I could do, but I'm not sure what I will be doing.  I'm sure it depends on what the assessments show, but do I as the "RTI person" work with kids in the classroom on work they're already doing in class like a tutor?  Do I pull-out the kids and work on certain skills that apply across the board?  If I do pull-out, what happens when the kids I pull miss classwork in the general classroom?  Do I try a variety of strategies in and out of the classroom?  I understand the three tiers; it just seems to be a new name for what most good teachers understand about kids, but what do I do once we know what kids are in which tier to begin?  Am I, the English teacher, going to deal with Math?  That's ok with me because my math skills are relatively good, but what about the "RTI person" who maybe doesn't know much of a certain subject?  Our school is also building in 30-45 minutes of "RTI Time" for all teachers.  What do we do then?  I feel like what I've heard so far about the tiers and the assessment is just the organizational framework, and that the foundation of our instructional strategies is absent.  What am I missing?  (I'm middle school, by the way.)