Initially, setup of your 1&1 Server will have to be performed by connecting to Remote Desktop. Remote Desktop is a Microsoft provided solution for connecting to a computer (or server) to which you do not have physical access. Using the Remote Desktop application, you will be able to see the Desktop of your Windows server and use the mouse and keyboard of your PC to perform tasks on the server as if it were sitting right next to you. Later, you may decided to perform regular administration via a web-based interface, Windows Remote Management, Windows Remote Shell, etc.
If your PC at home is running a version of the Windows Operating System, the Remote Desktop application will already be installed on your system.