Professional liability insurance is one that you should strongly consider because it protects your business from claims of negligence resulting from mistakes. The specification of the insurance depends on your industry and niche.
The next one is crucial - property insurance. There is a high chance that your business has its own space. This type of insurance covers the damages through fire, theft or natural disasters (may vary) for company equipment, inventory, furnitures and of course any property damage.
Workers compensation insurance is very important even with only one employee. Accidents can happen, even to the most safe and cautious people. It's to protect your employees and cover the medical treatments, disability, death benefit in the event you employees are injured or dies while working for your business.
If your business involves the use of vehicles it is advisable to get vehicle insurance, this includes policies in regards to those who use these vehicles as well. It protects your company in the event there is an accident and your employee is at fault. Getting an advance form of this insurance can cover injuries and liabilities for damages as well.
Depending on the type of business you run, the insurances you'd need will vary and might need you to get more than one. Regardless, to protect you, your company and your employees it is best to get it as soon as you can.
Professional liability insurance
Property insurance
Workers compensation insurance
Vehicle insurance