believe me this is the golden question
Most important , what ever your idea, have a comprehensive presentation of no more than 30 min and a mini presentation of no more than 5 min
Have a list of questions that you know the answers to readily, your investor will ask questions and you better have the answer pronto.

the best advice I can give is, there are tons of websites that offer investment money they are usually forum type sites
the idea is you post to as many sites as you can in the hopes of getting some attention, oh yes and a rich uncle is good too
hope this helps
Brian