Wisteria frutescens 'Amethyst Falls' is a good choice. I am attaching a link that should answer your questions. Wisteria frutescens (American wisteria) twines clockwise. I would replace the bamboo pole with a galvanized metal pipe, for long term durability, ASAP. Hope this will answer your questions.

Here's a link for reference about wisteria twining:
http://forums.gardenweb.com/forums/load/tngard/msg0712441719577.html

Here is a link that might be useful: Royal Hort. Society - see Growing a Standard Wisteria section