How many pc I can connect with cisco 2800 router with the help of any 8port,16port or 32 ports witches?

A router is to connect to different networks. So you need to know how much traffic you are running from this office to either other offices or to the internet. Are you going to have a lot of traffic going out of the office or is most going to be kept inside the network? What types of interface cards are on the router? What series switches are you using?