Evaluate your skills and knowledge
We have skills and knowledge that most of the people are willing to pay for, by evaluating your own skills and knowledge you can have an idea of what kind of services or products you can offer to customers. You will be amazed how many people could be interested in what you can offer to them. Few examples are: Tennis players use their tennis skills to startup tennis academy, good chefs use their skills to startup restaurants. If you do not have obvious skills like the example I made then you will need to look into your other skills and as well as your contacts which could help you to startup consulting business.
Look at your surroundings
The business ideas are all around us, but not many people can see these ideas or even if they do see some great ideas but they might not understand how they can turn that idea into a business. Look for small and simple business ideas rather than thinking about complex ideas, it is so hard to find complex ideas, but if you do get complex ideas and if you know how to turn that into business then it is great. Look at your surroundings to find simple and the easy business idea that can attract customers. Think about the business ideas which you can continuously add value. The greater the value of the products and services the greater the value of your company and the greater the value of your company the greater the attraction of investors to expand your business.