Networking, honestly. There is no "go do this, go buy this, etc" advice. You've never had a friend/colleague who needed contracting work done on their house? Or who was helping another friend develop a Wordpress site for their business? Or a person who knew a lawyer/doctor/plumber that could solve your problem?

That's networking. You start doing work for people around you and/or at conventions/social events for networking and then start cultivating long term contacts that continue giving work or referring others.