No one will invest a significant amount of money into a venture they know nothing about. Anyone who does will eventually lose their money to a scam artist.
Fortunately for you, there is a way around this concept: a non-discloser agreement. By having potential investors sign a non-discloser agreement that includes a non-compete segment, you have legal protection - allowing you to contact authorities if they do attempt to implement your business idea.
Another important thing I believe you should recognize is that no business is 100% guaranteed. You need to develop a solid business plan so that you and your investors know what will happen.
Read this article to learn about questions to ask before starting a business: https://hubpages.com/business/Questions-to-Ask-Bef...
Read this article to learn more about creating a business plan: https://hubpages.com/business/How-to-Develop-and-I...
Additionally, ask yourself why people should invest in you. You have said that you have the expertise in this field, but also say that an investor can take the idea and run with it. If what you are doing is legal, it will either require someone with a lot of experience/skill, or take a lot of hard work. This often deters investors from doing it themselves.
So spend some time to ask yourself several questions:
- How much money do I need?
- Who will my competitors be?
- How will I market my business? (This is much harder than one might think).
- What value am I providing to myself, my investors, and my customers?
- What needs to happen for me to break even? (You've made enough money to pay off your investors and all other costs and can start making money).
It's not easy to start a business (even one that seems easy). Write up a plan and think hard about how you can guarantee someone a return on their investment.
Finally, if your idea is easily mimicked, what will happen when other people see what you are doing and start copying it? Will you still be able to make a profit or will you lose everything? Most websites these days have a clone from India for sale within a couple of months. You don't want that to happen to your business.
Good luck and keep us posted about what happens!