It's kind of hard to put it but one thing that I know is that you must be prepared before you can achieve the results with your images. By the achievement I mean financially. You can not just take your camera and go for a photo shoot out.
There has to be some planning involved such that you start with research which can run for a few days before you get a lucrative niche or idea. It is then followed by scene selection which also is a determinant in your success.
The most crucial part is taking quality photos that can be accepted at stock photo sites and also the one that can generate a lot of income. Quality photos also depend on the camera that is being used therefore aim for a nice camera that take clear pictures even in low light.
There are other numerous factors that can have a great effect on your photo business so keep coming back to this site for more tips and tricks