The model
One trade, one town. Mobile RV repair in a county seat, gutter cleaning in one suburb, emergency locksmith work in a town of forty thousand. You build a small site about that one thing, get it to show up when someone in that town searches for it, then find a business that does the work and hand them the calls — either per call or for a flat fee each month. Every part of that happens before anybody pays you, in an order you cannot rearrange.