Import .bak into sql management studio 2008

I have a custom program that uses a database. I have little knowledge of servers but the way it works is by using a "local" server in the same computer as the one where the program is installed. I am trying to install the program in a new computer but I don't know how to set up the database.

What I have is a .bak file of the database and a list of the programs that are needed to have the "server" running:

-SQL Server Management Studio 2008

-SQL Server Configuration Manager

-SQL Server Surface Area Configuration 2005

Excuse me for my ignorance, but I believe this should be a very simple thing to do, however I am overwhelmed by all the information that there is so I would like to be pointed in the right direction.

Thanks.