Replying to Where to start?

First post, not sure if this is the right place for this. Just gonna go for it.

This season is going to be my second season skiing, and I really wanted to start hitting park features. In terms of sliding stuff, I was wondering if you guys would recommend starting off with boxes, rails, or tubes? Which one's easiest to get the sensation of grinding on skis down? Should I hit a flat feature or something with some incline? Any other general pointers would be appreciated as well!