First, Welcome!
We have several Board participants who have some experience with vanilla, so hopefully, someone will jump in. They do produce roots at the "nodes" where leaves also come out. I'm guessing that if some are lost, it will try again. A tree fern (hapu'u) pole can encourage rooting along the vine, or you can also train it up a piece of cork with sphagnum on it (so that it has something damp and firm to attach roots to) But look for contributions from other people, who have more experience with the genus than I do.
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