The best way to get used to going down a ramp with one foot is to go down a trail with one foot. The more you skate around on a slight hill, the better you will get. But for starters... lets just get you down the ramp without killing yourself.
I always tell my students 2 things when getting off the lift. 1. Keep the board straight. This is harder than is seems, especially if there are other people on the lift. Just keep the damn thing straight, don't try to turn it, and you should be successful (assuming there is no crazy exit.) 2. Get that foot on the board (while keeping it straight) and push the outside of your foot against the back binding. This provides extra grip if you don't have a stomp pad, but more importantly, it gives you something to focus on that has nothing to do with turning the board... remember turning on lift ramp = fall (until you get better.)
So just keep her straight with NO ATTEMPTS TO TURN OR CONTROL THE BOARD and keep that pressure between the outside of your back foot and the back binding... you should just slowly coast to a stop, assuming it is a properly maintained beginner lift. Some people may say keep weight on your front foot... but this is only important IF YOU WANT TO TURN. You can have weight on your back foot if it is flat, IOW as long as there is no toe or heel pressure that causes turning of the snowboard. Focus on going straight and you should be all set.
As for getting better at skating...
I would start with the back foot out on the bunny hill, and then position your board pointing downhill. Throw that back foot on the board and put some pressure against the back binding with that back foot. Imagine trying to push the back binding off the tail of the board using the lateral (outer) side of your foot. That pressure should keep your foot in place. Now just as you start moving, try to get some pressure on your heels (mostly front foot) and see if you can get the board to turn and start skidding like a normal heel turn. If you can't already heel slide down the bunny hill with one foot out, make sure you can do that first, and then attempt the above. If you start to feel out of control, just pop the foot off before you get going fast and you can save yourself.
I'll add: Make sure you can slide down the hill on toes and heels one-footed before you attempt an actual one footed turn like described above. I tell people to start dragging their free heel on heelside, and free toe on toeside, to give a bit of friction and speed control to your skid. So on your heelside, let the back 1/3 of your foot drag a little line in the snow behind your board as you skid down the hill. On the toeside, let the front 1/3 of your foot do the same. If you go too fast, just let the foot slide off to catch yourself.
Hope that all helps.
Last edited by BigmountainVMD; 02-07-2013 at 08:43 PM.