House churches are true churches, not just Bible studies or small groups. They have elders, they collect tithes and offerings, and the leadership is responsible before the Lord for the souls of the people in the house church (Hebrews 13:17).
Micro churches need to network together. New micro churches that network together remind us of a shopping mall. Most of the little specialized stores in a shopping mall would go out of business within a year if they were left on their own and not linked to the other stores in their market space. But together, they prosper. When various flavors of house churches learn to network together in a practical way in their city or region, they will experience great blessing from the Lord.
Here are several resources to help you understand how micro churches work.