Look up Michelle L'Amour "Your Biggest Fan" on YouTube or via her website. Her fan technique is incredible and the choreography is practically flawless. It's one of my favourites and the fans are beautiful.
In terms of courses or workshops in your area I'm unsure but here is the best place to find out.
However I have found that developing technique comes from watching as many performers of your particular discipline as you can and then practise, practise, practise! It would also help to take a ballet class as a lot of the choreography in classic fan-dance has its roots there.
x Lucille Burn
~Artist & Producer
RWP Productions
Visit Lucille on MySpace
Dr Sketchy Glasgow