Mt 10:1-7 Jesus sent out these Twelve after instructing them thus, “Do not go into pagan territory or enter a Samaritan town. Go rather to the lost sheep of the house of Israel. As you go, make this proclamation: ‘The Kingdom of heaven is at hand.’”
In prudence, God sends us first to those of our own house- the Catholic church. As we learn to trust God, as we evangelize, He allows us to start with those who have the same basic understanding of faith. But we are SENT. We are to evangelize to the LOST SHEEP of our house.
Later, after we have established a strong relationship with God, He may send us OUT- 2 by 2. For now, we have our mission, Go rather to the LOST SHEEP of our house, making the proclamation: "The Kingdom of heaven is at hand."