Short answers, pulled from the story.
Merten de Keyser set up his press to print the book on the 2nd of October 1528. This publication occurred despite official bans from church authorities who sought to suppress its radical ideas.
Anne Boleyn owned one copy and urged her husband to read it during his attempt to obtain papal permission for divorce from Catherine of Aragon. After reading the text, Henry VIII reportedly declared that this was a book for him and all kings to study.
The text introduces Caesaropapism as an ideology where national kings became heads of their country's church instead of the Holy See. Tyndale stated that powers ordained by God included temporal rulers who held the sword to punish sinners.
Historians believe this book greatly influenced Henry VIII's decision to declare himself Supreme Head of the Church of England in 1534. The king's reaction to the text reportedly convinced him of its importance for royal governance.
Wives must remain subordinate to their husbands always according to the text's instructions. A grudge against one's husband equated to a grudge against God itself within Tyndale's framework.