My Home is Now — Scott Anderson

This story is told by man from Earth named Ivan Dixon. Ivan tells his story in the first person of an accidental meeting with an alien race that has provided planetary protection for Earth for a very long time.
Understandably, Ivan would accept the job of coordinating the protection of this, and several other worlds, from invasion or extermination.
During his journey, Ivan will make new friends and save planetary civilizations, all with the help of a member of a machine race and a highly advanced interstellar ship.
Written from Ivan's perspective, the man from Earth will play matchmaker to a good friend desperately in need to exercise and prove his abilities.
Also, Ivan's new duties will take him to unexplored worlds and push him to work through dangerous alien contacts. Nothing can prepare the human for what he'll encounter, but he will have the support of Tar, his android mentor, and an intelligent saucer with few if any limitations.
Written for all age groups.