Missionary Onboard! gives you a snapshot preview of Christian missions and the types of Christian missions, including the benefits of Christian missions, an in-depth explanation of who is a missionary, types of missionaries, roles, and duties on the various types of missions, Christian versus Christianity, who is a Christian, what is Christianity, and what is a mission.

The book has a handbook of instruction for Christian missionaries, which includes the expectations of the Christian missionary, spoken language, body language, appearance, dress code, hygiene, footwear, accessories, hair and makeup, scheduling, safety, entertainment, music, television, radio, movies, videos, DVDs, internet, electronics, and computer equipment, camera, reading materials, group activities. It also includes instruction on the law of chastity, relationships among missionaries, mission leaders, the opposite sex, counseling, children, additional community service, local laws and customs, finances, offerings, housing, physical and temporal well-being, transportation, health, security, missionary assignment, responsibilities while on a mission trip, selling of goods, making promises, and the host country perception.

The book gives an example of how to establish an outreach mission ministry and the author's personal notes, including her experiences, missionary journeys, and those who influenced her life in becoming a missionary for the Lord.