It depends on what kind of graphics you want to make.
If you mean a program by 'graphic maker', you should definitely download Photoshop. Watch some tutorials and mess around to get the hang of it. Also there's Cinema 4D which is a popular program among graphic designers. You can create 3D texts/models in it; it's a useful program.
If you're going to graphic design, Photoshop is a must, so I think you should start out with that and then maybe you could expand to other programs.