Client server application

Hey. I want to develop a little archive application (Windows Forms 2.0, and C#), to store information about books. I want to be able to install the application on one or more client machines, and have them access a database located on a server. I will be using either MS Access or SQL server Express Edition. My question is, where and how do I place the database so that it can be used by the clients? What is the smartest approach?