Each new member of the Church needs three things: a friend, a responsibility, and nurturing with "the good word of God" (Moroni 6:4). You can be part of the effort to provide this help. You can always be a friend. Even if you are not in a position to extend formal Church callings or responsibilities, you can work beside new members in acts of service. And you can seek opportunities to share the word of God with new members.
Additional references: Mark 16:15; Alma 26:1–16; D&C 4; 60:2; 84:88; 123:12