Assaf is right in knowing that you are ahead when trying to validate an idea before just jumping in. In my experience, you should reach out to someone with experience in whatever field your idea should be. If it's more related to design of a physical product talking to an engineer would be helpful. If you have a business plan, you should find someone who has started some businesses.

I would think that the worst thing you can do is find someone who will just tell you what you want to hear because they want your money. You'll need to find someone that you can trust. This would be someone who offers a fair rate and has experience in what they do.

Do you have any more details on what you are looking for? I'll be happy to help you if I can!