If it was me, I would first get a mentor in the particular field you have, and run the idea by him/her to get their thoughts. Take them out for lunch or something like that.
If the mentor liked the idea, I would then put together a comprehensive business plan to show what I would be doing and how the business will make money.
You would then have two real choices
1) contact companies in your industry and see if they would be interested in funding the project, or undertaking a joint venture. People in the industry will understand your ideas well and will know if they will work or not. Also mention to them your mentor (if he is well known in the industry this will help)
2) contact someone through "business angels" and see if they want to finacially support the project.
The main parts they will want to know is will it work, and what percentage of money they will get.
As an alternative you could also contact a bank, but if they don't know the business well they may not loan the money.