Here's a real good article by Martin Dew-Hattens, former All England Champion. It has been posted before, but I think it bears a lot of importance to this discussion since it's all about deception! http://badders.com/news/item/540/Deception---The-Lost-Art-!
I'm not an expert and I definitely don't do deceptive shots all that much unless I have to. Thing is, my backhand shots aren't that strong and the only way to keep my opponent from giving me backhand clears is by making him think I'm sending the birdie close to the net but at the last moment, I send it to the back or vice versa. Left or right too. Even my serve has to be deceptive or he'll return the birdie to my backhand side, overhead. I didn't learn to fake my shots because I wanted to. I learned because I had to. The best way to learn is to watch other players perform their deceptive shots and try them too. Sometimes it comes naturally specially with drop shots sent to you. Have you noticed how you point your racquet at the shuttle when running after a drop shot? That's called tracking. You do it to anticipate the path of the birdie figuring out when you want to hit it. Do this exaggeratedly making your opponent think you're returning a net shot then right before your racquet touches the shuttle, pull your racquet down to allow enough power to make a reasonably long clear. I know it's basic but if you get that, you'll figure out how to do the rest. Try it when you return short serves. Hope this helps.
