I use to just loop the teaser through the dropper loop. It was easy, and it worked. However, I was corrected on this. Now, this is how I do it.....
Either, I tie my leader on to the barrel with a palomar, leaving a long tag end, and then on the tag end, tie a loop knot OR I tie the dropper loop. However, I tie a separate leader onto my teaser, and then I tie a loop knot to the small leader from my teaser, and connect the two loop knots.
Go to Bob's "how to" section of this website for detailed instructions on how Bob does it.
Don't limit yourself to plastics. Try flies, like deceivers or clousers.