Crazy Idea or Cool Possibility ??

So a few people have told me I should write a book. I laughed them off with a wave of the hand thinking they are nuts and I could never write a book. But as I got to thinking I'm wondering if I could actually do it.  I kinda know what it would be about but would people really want to buy it?   I'm running through the idea in my mind and they are racing at me one after another. So. I have loads of ideas but ideas get you nowhere if you don't have a plan.  So for now all I have is lots and lots of ideas and nowhere to go with them. Maybe my next idea will put me on the road with a real plan or make me realize it was all just a crazy idea like I figured from the beginning. I guess we shall see.