Little Fish with Idea for Big Fish – Patent Question

I’m hoping this subreddit is close enough for this kind of a question. Let’s say I have an innovative idea on how to design a better lawnmower, but I don’t work for a lawnmower manufacturer or anything like that, this idea is so good, I know it will be thought of by someone else soon, if not already. How do I:

1. see if the idea is already being worked on, and if not

2. see if the idea has been patented yet, and if not,

3. patent the idea

now, let’s say I’ve patented the idea, does that mean when a big lawnmower manufacturer comes up with the idea, they have to pay me first to build it?? or how does that work? and if there is a better subreddit for this question, please let me know

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