What is Worker Compensation.? How can i obtain it for my company?

I know that in CA I can not get workmans compensation on myself or any family members that might work for me. Different fields of employment have different pricing for workmans comp. We pay about $15 per $100 of payroll for general office cleaning and I know a roofer that pays $85 per $100 of payroll. You have to speak with the insurance agent that carries your general liability insurance for your business