You know what the right SS you will need depends on your triumvirate combination of ISO then Aperture then SS, not exactly in that order...once you set your ISO to either 100, 200 or 400, then you make up your mind on how you wanted your Aperture to be. Usually with still lots of lights you can get away with F/8 or F/11...then you sort your Shutter Speed.
Mind the needles going to the right or left...of the Exposure Compensation scale...as this takes care of the lightness or darkness of your image. Scroll your Shutter Speed to the left or right depending on how bright or how dark or how median you want your image to look like. Center doesn't always cut it for me. Moving that needle to the left (-) it makes the picture darker; to the right, brighter. Take a shot when the scale is in the middle.
Then move your shutter speed to the left by two marks, take another shot. Time to look at your highlight windows to see if there are some clippings there that blinks. If there is, move your shutter speed one more or two more to the left...look at your highlight clippings. You shutter speed will go down as you move it to the left. If you have no more space to move it, increase Your ISO or lower or Aperture. Either way will work to make your image darker or brighter too. Increasing your ISO increases the amount of light in the camera....even just one increment...or use the Aperture. The lower your aperture, the easier it is for your camera to speed up.
What I do, when I pick up my camera, depending on how much light there is, inside or outside, I decide how high or how low I wanted my ISO. Then my aperture (unless otherwise I am in an airshow); then I scroll my Shutter Speed button fast to the left and if it moves left or right, then I know I am on my way to determining the correct shot.
Sorry for the long response but this is the only way I can explain in detail my way...ask anymore questions if you are more confused about other things. In the meantime, in between, read about the Exposure Triangle. Google it. There are lot of good explanations about it that will suit your understanding better. Here are two simple articles to start you off...If I am able to find what article I used when I sat down in my deck to study my camera, I would have send that article to you, but I can't...
http://www.steves-digicams.com/knowl...-use-it.html#b
http://www.slrphotographyguide.com/c...ure-tips.shtml
Hope this helps...forgive my spellings and tenses, I am writing this response off my head and sometimes my fingers are faster than my brain...
ain't it always?