You can also use word of mouth, it's free and very effective. The only problem is some people don't know how to do that. They can't talk to you physically concerning their business. Probably they are shy. You can hire people to do this. Your friend who is in need of money, he or she will do it better at a cheap rate. You can also put in effort and approach your colleagues at work, boss and your church members. Some don't just want to pass through this stage themselves because they are not sure of the credibility of their business, this is a hindrance too.