Can I get a complete list or directory or website that list angel investors, venture capitalists, funders etc?

Find the right investor interested in this area and the answer is yes. investors come from many walks of life and are interested in things just like everyone else. Find wealthy individuals who are open to investing and find your area of business interesting and ideally understand it and could help with it as well.

I took a quick look at 500px who reported 1.5-million users in 2012 (source: Techcrunch http://techcrunch.com/2012/11/28/gorgeous-photos-in-your-pocket-500px-arrives-on-iphone/) with 10% as professional photographers. The article also mentions monthly growth of ~100,000 users. If your targeting the same market as 500px, use their reported numbers to back-up your assumptions. I'm sure there are other services who target the same user community - I'd spend some time collecting this type of data. Is your service designed only for professionals, or would you see a semi-professional (part-time) and advanced home-user?

Wow, sounds like you have an amazing profit margin. The key is GROWTH. Continuous and stable, with the ability to predict future growth. Therefore, your market niche is very important, to feed the growth curve within an order of magnitude and can't be too vague. As others have mentioned, investors look for a $100-200 million valuation potential, as well as the ability to morph or expand as needed. Contact me if you want to discuss more.

Simple: The right investor is someone who wants to invest on standard terms at a good valuation relative to your current stage. Extra bonus points for someone who has relevant industry connections that could accelerate your business and is willing - at the right time - to make introductions for you. But you should have really quite low expectations of most angel investors. Certainly they should have NO operational control of the business. Although I want to be as helpful as possible to companies I invest in, it's entirely for the entrepreneur to drive me, not the other way around. There are very few exceptions to this rule, for example when angels who actually do have very recent and relevant experience want to back someone who is inexperienced and need oversight in order to feel comfortable investing early. But this is a real rarity. Finally, to answer your question about what entrepreneurs do when they receive funding, they should spend it in the best possible way to accelerate the success of the business. I'd be happy to talk to you in a call to provide more clarity on the matter and also discuss when is the right time to accept investment. If you have people willing to back you, that's great. You want to make sure you have a clear plan and set expectations accordingly.

First of all BE VERY CAREFUL about exiting investors while bringing new ones on. You cannot give investors money back out of proceeds raised from new investors. It's illegal (called Ponzi). This is a VERY tough scenario since you are dealing with two substantial issues - 1) building (or rebuilding) a business; and 2) retiring investors. If the business is in fact "ruined" then you need to first decide if bringing new investors into that situation is a wise decision. You could be opening yourself up to legal problems. Investors invest in projects when they can 1) make money; 2) connect with the business; 3) add value; 4) believe in management. Unfortunately, having "previous investors" (especially bad ones) is like coming into a relationship with baggage. Most savvy investors will not want to participate. Advice: try to retire the investors BEFORE talking to new investors. Rebuild the business model and wait a few months before going after new investment. Showing that type of resilience and passion for the business could play in your favor and show new investors that you are someone who can overcome adversity to achieve success. So how do you "retire" investors? Convert the investment to debt if possible. If not, offer to sell the business to one of the investors. Do not sign a non-compete and start a new business. Also, depending on your stock purchase agreement and any anti-dilution clauses you could issue new stock and dilute everyone's shares to where the old investors shares are minimal (could have legal repercussions though so be careful).