I need your help plz

I have to do a project opengl ( language c ), the project is to create a surface with a tank, with the option to add buildings to the surface and move the tank with the keyboard.
is very important for me to pass

No one here will do your homework for you. Period.

If you have specific questions regarding specific problems, then we’ll be happy to help. Otherwise, you should consider what the assignment entails programmatically. Reading your description, I can immediately identify four key areas: Loading mesh data (surface, tank, buildings), rendering the meshes, handling keyboard events and, finally, translating handled keyboard events to transformation in 3D space for moving the tank.

thanks for answering
can you tell me how I can start to create the surface