OP, you can contact Sumter County building department to get the exact plans for your house, which will show where metal studs are used. As for mounting items to these studs, I have used small pilot drills and then sheet metal screws. Do NOT use plastic expanding inserts as these will get cutoff at the metal stud and may not provide the holding power you need, I know this from experience. Toggle bolts, or the metal expansion types can also be used. There are several people (handymen) that have a lot of experience in this area if you have an especially heavy item.
On a side note, double check the closet wire racks if you decide to keep these, only about 25% of the mounts and supports where into studs (metal), and I had to redo all of the mountings. This is where I had the problem with the plastic insets getting cutoff.
Hope this helps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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