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While the advice in other answers appears correct, it is critical to connect the "line" and "load" wires correctly to the GFCI. Here's a picture from a help page You can ignore the GFCI on the left.
You need to ground your switches -- Code requires it. And yes, standard single pole switches work here. Also -- depending on where the fixtures are located, you may wish to put one or more of them on the load side of the GFCI. Make sure that the existing black and white wires on your diagram go to the LINE terminals on the GFCI outlet!
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