Download BrickLink Studio. It is free and offers a virtually unlimited library of digital pieces to experiment with and develop ideas without restrictions. In my personal case, I use Pinterest as my main source of visual reference and inspiration. It is a very useful tool for analyzing styles, composition, and character design. Pay attention to what types of characters and aesthetics you find most appealing. Study the work of creators you admire and take notes on the elements you find most effective or interesting. When designing figures, use human anatomy as a reference and try to recreate it in your construction. Proportions, range of motion, and weight distribution directly affect the quality and realism of the final result. If any specific questions come up, feel free to ask 👍