Start Googling!!! Hahahahaha! I used CoverGirl Queen collection before Bare Minerals. If you really want to try them, you just have to buy and try...sometimes you may have to mix two colors with drugstore brands, sometimes not. You can run into that with dept store brands too, but they usually have more shades. Wait for a BOGO free sale!! Check the store's return policy too. It's hard to tell your complexion/skin based on your avatar so I won't ramble off what color I think would suit you from that line. If you want natural, invest in a face brush for powders and use that to apply whatever you buy, you can find good ones at Target, like the Sonia Kashuk line. Even e.l.f. cosmetics ($1!), though their regular line, sometimes the brush part becomes detached, lol.
Btw, a lot of women walk around with the wrong shade on their face for years. Go brave and start experimenting!