Directly related to business luck are Output star 食 Shi-shen Food God，伤 Shang-guan Hurting Officer and Resource stars 印 Zheng-yin Direct Resource and 卩 Pian-yin Indirect Resource. The other Ten Gods that can bring opportunities and business luck are 官 Zheng-guan Direct Officer and 杀 Qi-sha Seven Killings.
They must be your favorable Ten Gods (XiShen 喜神) or most Useful Ten Gods (喜用神) and must have support without major clashes.
Now, let’s take look at his BaZi four pillar of destiny.
In his BaZi, fire his Output Stars or 伤食 Ten Gods are rooted and with support from wood. It is good for him to do business once fire his Output star 食 Shi-shen Food God，伤 Shang-guan Hurting Officer are further strengthened and have support.
1990 BingWu 丙午 TaYun, fire sat on fire, right after he stepped in his 1990 BingWu 丙午 TaYun in Mar 1990 and with 1990 GengWu 庚午 another Wu 午 fire, he started his noodle house business in April, 1990. Geng 庚 metal is about changes. His business is still doing well until today. For a business to succeed, we need to look into his following TaYun. This following TaYun must have supports without major clashes.
Warning: If you see your 喜用神 in your current TaYun but they are hurt, doing business can be bad.