The Jesus believers were meeting in people's homes. Members of that community would take turns using private homes to gather. Thus, they went house to house.
These footstep tracers of Jesus (they called themselves Akolouthontes "followers" or some called themselves Mathetai or "learners.") were puzzling out what it meant to follow Jesus. Who was he...really? Was he going to return? Why? When?
Each was curious about the others. Maybe somebody else knew something they didn't? They sought each other out....with questions...
If somebody brought word that another house in another town had Akolouthontes or Mathetai a person would be appointed as an emissary. These emissaries were called Apostles. The job of an apostle was to contact other believers and create a network with them.
This is quite incorrect. There were many who had met Jesus and tried to follow his ways. They were called disciples. They were not a religion, just different people who met Jesus or heard of him and put their limited knowledge of Jesus and his teachings into their lives. Not a bad thing, just not a religion.
Jesus did start a church and commissioned his [12] apostles to start it and promote the growth of His church by doing ALL that Jesus had commanded, not just some of what he commanded. This is known by how each of the apostles started to grow His church with consistently similar teachings and sacraments. It's called history. Door to door? Maybe that happened, but that's not how His church grew. Just saying....cause its's true