I haven't skied in seven years. When I skied the last time I still had old school equipment. My skis were K2 straight with flat backs. I decided to get back into skiing so I bought all new equipment for this season. I purchased three different type of skis all twin tips because I wanted to learn how to ride rails & boxes, half pipe, & ski switch. When I skied in the past I only did groomed runs and some powder. My father also bought all my equipment for me and never taught me anything about the equipment. I had to do research to learn about the new skis and equipment and what to buy. I'm 5'6" 146LBS and when I use to ski I was able to ski the whole mountain. I can't remember how long my old skis were. The skis I purchased are 2010/2011 NINTHWARD MIP TOSH PETERS PRO 174CM, 2010/2011 ROSSIGNOL S4 168CM, AND 2010/2011 ROSSIGNOL S5 171CM all my bindings that I have for these skis are the FKS 14 L and XXL. I wasn't sure where to mount the bindings on any of these. I had a shop mount one pair of my FKS bindings on the Ninthward skis but I'm not sure if they were mounted correctly. The other two have yet to be mounted. He asked me if I wanted them true center or what. I didn't understand what he meant or where I should mount them so I told him what I wanted to do with the skis and he mounted them. So here is what I would like to do. I want to learn how to do things in the park as I stated above. I already know how to ski the whole mountain except for park. I want to be able to ski down the groomers go in some powder every now and then and go in the park to learn how to do switch, rails and boxes, halfpipe, etc. So I would ski 40% groomers, 50% park, and 10% powder. Can anyone please explain to me why you would mount them true center or so many cm back or forward from true center and what that means and why you mount them that way? I'm sorry I'm such a noob but like I said my father bought me my equipment and never taught me anything about the equipment. I just learned how to ski.