Some IBs combine information brokering with other services they offer. For example, some of my students who have existing freelance businesses in computer or other types of consulting, technical writing, journalism, or translation services have expanded their services by offering information brokering services to existing clients. Many IBs are generalists and provide all kinds of information. You must target particular markets. Many people begin as part-timers and build their client base slowly, some times taking a couple of years or more before they are ready to go at it full time.
Some people start by moonlighting.
Most of your time in the beginning focuses on marketing and business development. You can build the business slowly while generating income from other sources and in some situations even subsidize your IB business development. How you choose to develop and operate your business can depend on your ability to adapt yourself to circumstances. An IB working from home can do online research as a key method for de developing a home business. You can either learn how to do online research or you can subcontract jobs to other information brokers.