Andy Dunn, co-founded pants designer and retailer Bonobos in 2007 with his former Stanford Business School roommate Brian Spaly. So far, so good. The two are making a killing at their new venture.

But it's not been all that easy.

"My co-founder and I have highly overlapping skill sets," said Andy, in this segment of "Lessons for Entrepreneurs." Working together has been an “enormous challenge," he added. Andy's advice to former roommates or friends thinking about working together is this: Think about your relative contribution and the architecture of your business relationships. "It's critical."

Fortunately, the two have been able to preserve the friendship, he said. 

Other lessons include hiring well. "Firstly, hire all-stars and delegate," he said. Bonobos coaches its employees to take a leadership position and after a month, many of them are set free to make their own decisions. Another lesson is treating employees well, said Andy.

The key to phenomenal customer service starts at the top, he suggested. Managers should empower their employees and treat them with respect. That culture gets passed along.

So, how do you create that sense of respect and service?

As Andy puts it:  "It comes from designing roles in an environment where people can come alive every day."