a suggested mixer

This might sound dumb but,where do i plug the 4 outs to on a 24 track mixer(i didn't give a specefic model because I figured they pretty much have the same inputs and outputs)?

on the 1st four inputs of the mixer.....Found at either the back or on the top of your mixer....You can use ALL 6 if you got enuff wires (remember to pan in the internal mixer so your stereo outs act as MONO)

like on this begringer mixer there are inputs that say line in, line insert above each channel do i plug it into the line insert or line in?