Learn to throw your sled around down low first. Practice powder turns in the meadows. Go both directions then transition to figure 8's.
Ride in the trees.
Start on gradual hills and learn to sidehill in both directions then practice switchbacking up those same gradual hills.
Then move to some steeper stuff with room to turn out and practice turning out. Nice wide inverted U's at first, then getting narrower and narrower until you run straight up, pull a nice 180 degree buttonhook turnout and return on your same track.
At some point you will get on a hill that's long and steep enough where your sled runs out of grunt and you will need to transition into a sidehill to gain some smash before turning back uphill, or it's got an obstacle that you need those tree skills to avoid, or you commit to a narrow place where big arching lazy U turnout are just not an option and you either stand it on it's a$$ and 180 out, stick it and dig out, or lose it watch your baby yard-sale down the mountain.