networking 2 building

Hi,

i have a customer who wants to network two of his branches (about 250KM apart) and wants me to do it. He’s requirements are just that the staffs are able to share information and database.
I thought of VPN but I don’t really know where and how i should start. Any tips?

And.. aside from VPN is there some other technology I could you. I’m kinda new in VPN..