Thank you both for your advice

Roger, I only wish that I could see it as being as simple as that! I have no contacts in the industry, other than a community of amateur photographers on a few forums, certainly no-one that I know well enough to quiz about the feasability of my idea, never mind the fact that they aren't "insiders".
I have a small amount of cash to invest, but I am keen to do this wisely, and with an informed mind (which is why I think I need to run my idea past a few people). Shuold I invest in a website? A course to clue me up more on how the industry operates in detail? I also have questions that I need answering with regards the specifics of how to set up this particular idea - where to start, how to grow, etc.
I guess they're pretty lame Qs to an experienced entrepreneur, but they're Qs that I don't know the answers to!