For the investment promotion commission for novice Douyin, it is recommended to fill in an appropriate commission. Generally speaking, you can decide based on your actual situation and ability. If you have more resources and experience, you can increase the commission appropriately to attract more merchants. However, don't be too greedy. Proper control of the commission can allow you to obtain more stable income in the long-term investment promotion process. In short, choosing an appropriate investment promotion commission can help you better attract merchants and increase your income.