You have to make two primary choices regarding your network setup. The first is whether the network be organized around a server (a "client/server" network) or peer-to-peer (each computer of equal rank). The second choice is whether the network will use wires (ethernet) or be wireless. These decisions will effect the speed of your network and the stability of your database connection.
Compare Peer-to-Peer to Client/Server
Compare Ethernet to Wireless 802.11x