What to do with the super idea?

I think that many habra people periodically have ideas of various start-ups, services and the like. Some ideas are completely stupid, some are “in-this-something-is”, and some seem just brilliant. Stupid ideas are forgotten, normal ones can be realized and see what happens, but what to do with a brilliant idea? Such an idea that seems so cool that it becomes scary, what if you make a website, a large company sees it, spends a lot of money, makes its own analog, and you simply cannot compete with them. Or this: you will make a website, but you will not be able to promote it effectively, and only two or three hundred people will know about it. I can assume that in such cases there is a need for an investor.

In this regard, I have a whole bunch of questions for knowledgeable people:

1. Is an investor really needed or are there any other ways?
2. Where to look for an investor?
3. With what to go to the investor: with the idea, with a ready, but not launched product or with an already working site?
4. Do I need to patent an idea?
5. What responsibility do you have to investor?
6. What are the risks?
7. How is the profit divided (in some typical cases)?
8. Who will be the owner of the resource?
9. What is the role of the investor in the development, launch and promotion of the project?
10. What happens if the project does not justify the investment?
11. Update . Let's say the money received. What to do with them? Hire people?

In a word, I would like to get some kind of action plan, when there is a great idea, but there is no possibility to implement it on our own. After that, it would be possible to issue answers in the form of a separate post.

Update: Specifically, in my case we are talking about a new (at least I have not seen or heard about analogs) format of the organization of the blog.