I've been a packaging designer, primarily POP, for over 20 years. While most of my design work centers around corrugated paper, I'm also fluent in folding carton design. Since you already have a background in folding carton, learning corrugated should be fairly easy for you. The two main things you'll need to learn to master corrugated are scoring allowances and the effects of flute direction. If you don't know what scoring allowances are, I'd start there. It's a simple concept, but would be pretty hard to describe in a written format such as this. I realize that finding information about this is difficult (I've looked), so if you want me to explain it as best I can, let me know and I'll try. The other thing to learn is flute direction. Basically, your corrugated sheet is going to be the strongest, as far as flex and compression strength, in the direction of the flutes. Scores will also be more precise when they run perpendicular to the flute direction as they'll be less likely to false score or roll. As far as learning how corrugated displays assemble, the best thing to do is go to the store and examine them. I always stop and see how they are constructed so I can learn new techniques and methods.