According to Igor Roitburg think about what you already realize business. Use your work experience as a guide. Maybe there is stuff you have witnessed or realized that wasn't a part of your daily tasks which you'll be able to use for your business.
As an example, have you ever listened to what others are saying while you're at the office? Whether you hear coworkers or supervisors talking at work, there are possibly some bits about doing business that you simply have picked abreast of.