First make sure your sources are actually 24.000fps or 23.976fps. Both happen, and a lot of semi-pro camcorder manufactureres shamelessly label something 24p when it is in fact 23.976p.
If your deliverables will need to be 23.976, you may choose to edit in 23.976p. But IF your sources are 24.000 then this means you would have to slow down your picture from 24.000fps to 23.976fps, and you would need to perform a similar slowdown to your sound. This method is frequently used in the 60Hz world. Picture is then shot at 24.000fps, sound recorded at 48048Hz, picture is slowed down to 23.976 (in telecine or on an HD deck), sound is slowed down by slowing it down to 48000 samples/second.
Or you work in 1080/24.000p, then perform such a slowdown on your final product.
Since there are quite a few ways to go about any of this, it would be relevant to here what your source footage is, how you are bringing it in, if it’s been recorder double system or not.