In the post-epidemic era, the rise of the street stall economy has driven the rapid development of China's cultural innovation industry, giving the creative market a fresh perspective. The work aims to deeply understand and explore the critical elements for startup of creating creative market brands and to identify their inherent principles to provide systematic and scientific design ideas for creative market brand entrepreneurs, enabling them to work efficiently. Data mining was conducted using Python crawler technology in combination with the three-level coding research method of the grounded theory. This approach refined concepts and categories, uncovered their internal logic and correlations, and ultimately constructed a theoretical model. The study extracted 4 core categories, 13 main categories, 609 sub-categories, and 4 872 related concepts. Based on these, a brand start-up model was constructed, focusing on four core elements:market brand creation goals, market brand audience, overall content planning, and brand operation. By integrating sociological and design methods, this study reveals that creative markets exhibit strong vitality in the post-epidemic era and play a positive role in promoting the development of the street stall economy and cultural innovation industries. The findings provide practical guidance for novice entrepreneurs. Future research should focus on the diversity of creative markets, the establishment of theoretical frameworks, and the application of interdisciplinary methods.