How can I become a game designer or cartoon designer?

Try by starting to draw basic diagrams and images using pen tool or curvature tool. I find curvature tool easier to use. Draw in either Photoshop or illustrator, it doesn't matters. But if you are able to handle these tools easily then you'll be able to create anything.

Based on your qualification, you can opt for Diploma/Degree in game designer/developer. It needs pre-requirements based on your choice of specialization. If you are a 12th student, you can choose a long term degree program from various popular universities. Designers may need a Bachelors degree, esp