OP, first if you have metal studs, you cannot use plastic anchors. Now the easiest way to determine the studs, use a small (1/16 inch) drill bit, drill into the area where the stud is, if it stops under light pressure, you have a metal stud, if it continues in slowly, you have wood, if it stops and goes in suddenly you have metal. As noted above there are special devices for metals studs, but I have successfully used the 1/16 inch bit to make a small hole, and then used a sheet metal screw large than the hole, do NOT over tighten. I had to redo all of the metal shelving in our house as i wanted it a heights different than what the builder installed and wanted a second layer of shelving. That was several years ago everything is still standing.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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