Wireless networks are nowhere near as fast as hard wired networks and a great deal depends on the location of the PC's. You may have to experiment until you find a suitable setup. Not only does it depend on the distance but also the composition of the walls and the thickness that the signal must travel through. If at all possible use a hard wired network. Its cheaper to set up, faster and causes nowhere near as many problems as wireless networks.
However, masses of information can be obtained by visiting the Google website and searching for -