Security guard LLC

I need some advice. I work as a security guard for an employer in the state of CALIFORNIA , but I’ve started taking side jobs as a security guard during my time off, meaning on my own, customers like how I work and they want to book private security work with me without the company I work for:

To protect myself from any liability since I don’t have a company ,

Should I form an LLC to protect myself from liability? If so, does anyone here have knowledge of the steps involved and any licenses I might need to set this up?