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I still use VMD sometimes but I don't use GAMESS anymore. It is a bit difficult to make recommendations without knowing your knowledge level and the operating system that you are using. If you are comfortable with Python, you could start with Psi4. If you know how to compile programs you can try building and running NWChem. Orca is also popular but I have not used it myself. If you are at a university you may have access to other proprietary quantum chemistry programs such as Gaussian or ADF. You can choose any of the programs available to you, and then follow the tutorials and examples in the manual. Once you understand the basics it is easy to learn how to use any program as they all share common features.