I am using a Nikon D60 with a Speedlight SB-600 flash. The iTTL is turned on and the camera is in Baby mode setting. In terms of settings is there any main things I need to learn? For example do I need to use the zoom mode on the flashgun when in iTTL mode? Should I use a diffuser or not? When do I tilt the flash head and how much? ....and similar type of advice? Any advice would be greatly appreciated.