General Information About Businesses

I'm planning on owning my own business and would like some information on some questions I asked myself that I'm not certain about.

1. How can my human resource staff be benefical to my employees and customers? Can taking care of my employee also have a negative impact on the customers and the management or me as an owner?
2. Why is training so important and what type of training should I offer my employees?
3. To increase net profit for my company I must sell more volumes, raise prices, or reduce expenses. As a retailer is it always possible to do all these? What unintended consequences could occur with any of these strategies? For example if you cut costs, will it affect volume? Could excessive volume have a negative impact? Alternatively if I seek to increase demand then will you necessarily succeed? What factors could keep you from utilizing this strategy as well as the others?