I'm assuming you are talking about mics and not triggers... in which case they are just like any other mic. The difference is their sensitivity to the different drum frequencies and how they are mounted.
We have a Shure drum mic kit - it has a kick drum mic, a snare drum mic, two high toms, a floor tom, a hi hat and two overheads.
The kick drum has a special low mic stand stand, the hi hat and overheads use standard mic stands with booms - the rest of the mics use special clips that attach to the rim of the drums.
All of these are fed into the stage snake that goes directly into the PA.
We had one situation where we set up outdoors and the snake didn't have enough channels, so we used a small mixer just for the drums that mixed it down to two channels for the snake.
thats the kit we are thinking of purchasing but if all these mics have thier own cable its going to take all the channels on the pa,does the stage snake consolidate all these cables into 1 or 2 ,or we have to get a mixer for all these cables as we have 8 channel pa and we are using 3 of them for vocals ,bass amplification and rhythm plus what kind of mixer you guys suggest ?