Replying to First trick for boxes and moving on to rails tips?

So my last post was asking about sliding boxes and rails well i spent the last weekend skiing ad spent a good amount of time in the park. I ended up getting boxes down i can hit every one in the park now no problem. Now im looking for some tips on first tricks to try on the boxes and how to start trying them as well as how to move on to rails because i started attempting rails and i cant seem to get centered and so end up jumping at them from the right side and hitting it then sliding off the left side before i evenget balanced. So any help would be appreciated because i really dont have anyone at my hill to help me. 90% of the peopl at the park are boarders who suck at park and then out of the few skiers that are there ive only seen 2 out of the like 10 total ive seen since the season has opened actually doing anything better than simply sliding boxes like me. Thanks in advance