Suggestions for building a site in CQ5

Hi,

We planned to develop the site in Adobe CQ5.

Since this is my first project i dont have much exposure in CQ5.

How the multilingual will be achieved in CQ5 ? 

i.e., in top of the home page we decide to have a select box which contains all the countries.

If user selects specific country then the whole page needs to convert into that select language ?

Please help me out with your suggestions?

Thanks in advance