I'm not a businessperson. I have no sense of money. My mom does everything for me. She makes all my decisions for me, and even buys my clothes. She's very protective.
Research your idea. See if there's a demand. A lot of people have great ideas, but they don't know if there's a need for it. You also have to research your competition.
It's good to stay as close to real life as you can, and then kind of dress it up.