I agree with plin - you'd be best off learning on a comfortable bike. I would suggest a so-called "granny bike" style is great because, as the name would imply, it's easy to ride. However, I think the first point is where you can go to learn.
Where are you? Maybe you can find a local bike shop that would allow you to test ride some bikes to get the feel of them, or at the very least they would know of any other places or courses that would be useful.
MichaelW, a series of sweeping curves? Now I've heard everything
