The first thing you have to do is to select the C/C++ perspective. You can do this by clicking the icon pointed to by the red arrow and selecting C/C++.
Your workbench is now configured for C/C++ development.
Next select File, New, C Project from the main menu.
Enter the name of your project, FirstCProject, and for the executable type select Hello World ANSI C Project, and then click on the Finish button.