1. Understand the problems that you solve
The starting point in defining the target market for your proposition is to understand the problems that you solve. Once you have a good idea what these are, you can start to work out who is most likely to suffer from these problems.
2. Paint a picture of the customer
Start to list all the different types of customers that suffer from the problems you solve. Once done, you can start to build up a picture of these customers. Group them by location - for example, high net worth individuals tend to live in certain postcodes. Group them by market sector - are they manufacturers, recruitment agents, and so on.