Replying to First time doing rails

I've been a racer since I was 5 and a couple years ago I quit and started getting into more backcountry skiing. I bought some park skis last year (line chronics) but never really put them to good use. I've never done rails before but I want to get into it because it looks fun as fuck.

I was wondering if any of you guys have some suggestions for me? Like what should I expect, where should I put most of my weight when I'm on a rail etc. Thanks!