there are actually some tutorials out there, I could probably find you one or two. I just get a gather on the tip of a ivory or dark ivory rod, and when it is the size I want, I marver it little to get more cylinder shape, then I wrap this cylinder into the silver foil. Make sure you smooth it out with a paddle or on a marver, if it is not attached well, it just burns off. But when you burnish it it leaves these tiny bubbles, then I just pull it into stringer. I think the trick is to marver the foil really smooth on glass before putting it back on flame.
I hope this helps, I will try to find you now a tutorial.
Pia