Short answers, pulled from the story.
Wyatt's rebellion started because people feared Mary I would marry Philip II of Spain and turn England into a province of the Habsburg Empire. The population worried about foreign wars, higher subsidies, and the return of the Spanish Inquisition.
Thomas Wyatt led the uprising from Kent while Sir James Croft, Sir Peter Carew, and Henry Grey Duke of Suffolk planned to raise forces in their respective counties. Historians also name William Thomas as an original leader who initially plotted to assassinate Mary.
Wyatt started the uprising on the 25th of January 1554 by raising his standard at Maidstone. The rebellion effectively ended on the 5th of February 1554 when intercepted letters revealed the goal to dethrone Mary, leading to mass surrenders and executions.
The rebellion began in Kent with Wyatt raising his standard at Maidstone and setting headquarters at Rochester. Forces marched toward London where insurgents met royal delegates near Southwark before being routed or surrendering.
Mary summoned Elizabeth to London on the 26th of January 1554 but imprisoned her in the Tower on the 18th of March due to evidence linking her to the rebels. She remained confined until Throckmorton was acquitted and political pressure eased following Philip's request for leniency.
Out of some 3,000 captured insurgents only about 150 were executed while others received prison time before release. Lady Jane Grey and Lord Guildford Dudley were also executed despite having no part in the rebellion.