It is important to understand that SfM techniques, while highly effective, have certain limitations in the kinds of imagery that can be effectively processed into point clouds. The techniques are dependent upon finding matches between subsequent images and thus can have trouble processing images that are smooth, are missing the camera's embedded Exchangeable Image File Format (EXIF) information, or are from cell phone cameras.
We will start processing an image series into a point cloud with a photo series that we know largely works, but as you experiment with SfM, you can feed in your own photo series. Good tips on how to create a photo series that will result in a 3D model can be found at https://www.youtube.com/watch?v=IStU-WP2XKs&t=348s and http://www.cubify.com/products/capture/photography_tips.aspx.