Now I dont know a lot about digital cameras, but I know a heck of a lot about flash. After thirty years using flash, from bulbs to electronic, I picked up a little bit. So here let me pass on what I know and you can tailor it to your camera's abilities. You can do two things with electronic flash. You can use it as a main light, and you can do what we called shutter drag to use it as a fill light. As a main light you want to over power the existing light. As a fill light you want to balance it to the existing light or have it a wee bit under the exiting light. So what you want to do first is decide, do I want this scene lit by strobe completely or existing light with fill strobe. flash power just read the room light. Make sure your shutter speed is higher than it would take to shoot the room at the strobe's fstop, if it wasn't there. example strobe should be set at f8. At f8 existing light would give a ss of 1/15 if you set the camera at 1/60 or more you should not have any light but the strobe to power the scene. maybe with only a small amount of background light. You wouldn't need a tripod because the strobe is the shutter. it fires from 1/1,000 to 1/10,000 usually. Balanced light... same example. if you read f8 at 1/15 and you set shutter speed at 1/15 you will get all the room lit just as if the strobe wasn't there. But you need to have a tripod for a 1/15 or lower because of camera shake. You are exposing for the existing light not the fast shooting strobe. The strobe will simply add a different dimension to the light. These days this method is used a lot more since in digital you can see the effect immediately and know if the worked correctly. Im sure there is a lot more to it these days but this is the main way I used stobe light. You do have to keep in mind there is a flash sync speed you cant exceed in film cameras. I'm not sure about digital I wouldnt think so but I dont know. Please feel free to correct me if im wrong here.