The direct-to-consumer playbook at this point is well known: Launch online with one product, expand to physical stores, and stretch into new products and even categories. For Brooklinen, the online-born bedding brand, it's no different. The company, which made about $48 million in revenue last year and says it's on track to be a $100 million company, just experimented with a pop-up store in SoHo last year. It has also expanded to bath wear, with more to come soon. Founder and CEO Rich Fulop said it comes with taking a broader view of the category. He talks about the best marketing channels, building a creative team in-house and more.