The following are some procedures and precautions to be prepared:

1. Apply for a business license: you need to apply for a business license from the Ministry of Commerce of Singapore. Business license is a necessary document for legal operation. Without a business license, it is illegal to operate. You need to choose a self-employed or enterprise according to your own scale, and prepare relevant materials, such as ID card, site certificate, rental contract, etc.

2. Get the relevant license: If your beauty salon or health club provides services such as body care or tattoos, you need to get the relevant license. These licenses may vary according to the specific service type, so you need to consult the local government departments and abide by the relevant regulations.

3. Establish facilities that meet the requirements: Your facilities need to meet the requirements of the Ministry of Health of Singapore, including cleaning, disinfection and garbage disposal. This helps to ensure the safety and health of your customers and services.

4. Recruit and train employees: You need to recruit and train qualified employees who need relevant skills and certificates. In addition, you also need to abide by the provisions of Singapore's labor laws, such as wages, working hours, benefits and so on.

5. Conduct market research: Before opening a beauty salon or health center, you need to conduct market research to understand the local competition, customer needs and trends, which will help you better formulate business strategies and attract customers.

In short, to open a beauty salon or health pavilion, you need to prepare sufficient documents and procedures and abide by relevant laws and regulations. If you need further help, you can consult relevant local departments or professional consultants.