Alfonso Valdes , Jul 29, 2008; 12:34 p.m.
Don't know tutorials, but I can tell you a couple of points. In P mode, the camera will usually choose 1/60 at the maximum aperture of the lens, and the flash intensity will be adjusted for the nominal exposure. This is usually OK, but may not be fast enough shutter speed or give you as much DOF as you might like. Also, if you compensate exposure on the camera, this will not work with flash pictures. To do that, you have to use Flash Exposure Compensation, which you can do from the camera menu or on the flash.
If you set the camera on M mode, select, say, 1/100 at f5.6 or f8, the flash will give the nominal exposure, and you can adjust using FEC for special situations (example, dark background, set FEC down a stop or two).