I am only responding to this question because I have recently done the exact thing. It may not be the best solution for your question but in my case this was something I started doing with 3 other friends. We all have other sources of income but really like building and designing things so we have recently put our money together and started repurposing small shipping containers as homes. Start talking to some friends or colleagues and get a feel for who might be interested in doing some projects on the side to bring in some side-income. Are you hoping to become a developer or just a property owner/manager?