To begin, you'll need to use a tire iron to remove the nuts on each wheel. After doing so, lift up one side of the vehicle with a jack. read more
Generally speaking a vehicle with 4 wheel disc brakes will have one pair of pads for each wheel. This covers about 99% of the vehicles out there. There are rare exceptions, some calipers have multiple pairs of pads (mercedes S63/S65), and some vehicles have multiple calipers at a wheel (Maybach Mercedes). read more