Short answers, pulled from the story.
William Kempe appeared at Leicester House in May 1585 for the Earl of Leicester. This event marks his first entry into the historical record as a professional actor.
William Kempe morris danced from London to Norwich covering a distance of about 110 miles or 177 km. The journey took him nine days spread over several weeks amid cheering crowds.
Richard Tarlton was a great clown whom Thomas Nashe called the ghost that William Kempe succeeded. Nashe referred to Kempe as the vicegerent general to the ghost of Dick Tarlton, suggesting contemporaries viewed him as the successor to the great clown Richard Tarlton.
William Kempe is with certainty associated with Dogberry in Much Ado About Nothing and Peter in Romeo and Juliet. Scholars deduce probable parts like Costard in Love's Labours Lost or Bottom in A Midsummer Night Dream based on speech prefixes and stage directions.
The parish register of St Saviour Southwark records the death of William Kempe a man on the 2nd of November 1603. He died unregarded and in poverty circa 1603 after years of financial struggle.