New Plumbing Business

Looking for advice on building a plumbing business from scratch …

I’m in a somewhat unique position of starting out in the plumbing trade in my mid 30s and not having much technical background besides having taken Plumbing 1 + 2 at adult ed in the evening and done jobs around my own real estate investments over the years. I have a friend who has been a licensed plumber for 30 years and will hold his license until I have the requisite number of years needed to sit for the exam and hold the license myself. What I would like to do in the meantime is form a company and start building a business with small jobs and service calls. I have access to extra manpower and expertise if I need to call in help.

What is the best way to go about this as an entrepreneur? I’ve owned other businesses but I don’t know where to start or how to network. Advertising? AngiesList, HouseCall, Thumbtack? Postcards to targeted areas?