Replying to Just bought first pair of twin tips

Hey guys just bought some k2 extremes and im just starting to get into freestyle skiing and i was wondering if there was anything i needed to do to get them ready for winter. I know i needa wax them and ive also heard that i needa dull some of the edges. But im not sure how much to dull it. Ive also read around the forums about the k2 extremes and a lot of people say that they wouldnt use them on rails and i was wondering why not and if i did would it be really bad for them?