I took photos this weekend at a huge old catholic church and most of them came out terrible. I took up the iso to 640 and 800 on some. I also turned the shutter speed down. the pictures had some blurring because I was 6 rows from the alter. When I was up close with the flash right on the photos came out pretty good. What should I do in this case scenario again. I would like to take photos for a living (it has always been my dream). Also could you guys recomend some good lighting for portrait and wedding photography?