The reset is fairly simple, though it should probably be done out of eyesight of your audience.
You can chose the outcome when you create the gimmick. If you would like you can make multiple gimmicks for different outcomes.
Once you have done this all that you need to do is be ready with the single card gaffs to reset the trick with another card.
I hope that's clear. If not feel free to contact me directly: josh@penguinmagic.com