Help citing sources correctly to post personal work online

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I just found this website, AssociatedContent.com and want to start posting some of my writing. They explain their rules on citing resources, etc but I'm nervous to post work because I don't want to have overlooked something or misunderstood it. I have writing that is purely from me (fiction, etc) but am somewhat new to research papers/articles. I think I'm a little confused in general about when you NEED to cite something. For example, if I want to research something and write an article on it, where is the line between citing and not citing? If I'm writing about sunblock and anti-aging, isn't ALL of the information I find someone else's? Is there a good beginner-type tutorial online that might clarify things a bit better for me? I think I might be making this way more complicated than it needs to be, but that's what I'm trying to fix. Thanks!