Answer by taking a quote from the following article:

Eric Arthur Blair (25 June 1903 - 21 January 1950), better known by his pen name George Orwell, was an English novelist, essayist, journalist, and critic. His work is marked by lucid prose, awareness of social injustice, opposition to totalitarianism, and outspoken support of democratic socialism. Orwell wrote literary criticism, poetry, fiction, and polemical journalism. He is best known for the allegorical novella Animal Farm (1945) and the dystopian novel Nineteen Eighty-Four (1949).

This job was as a part-time assistant in Booklovers' Corner, a second-hand bookshop in Hampstead run by Francis and Myfanwy Westrope, who were friends of Nellie Limouzin in the Esperanto movement. The Westropes were friendly and provided him with comfortable accommodation at Warwick Mansions, Pond Street. He was sharing the job with Jon Kimche, who also lived with the Westropes. Blair worked at the shop in the afternoons and had his mornings free to write and his evenings free to socialise. These experiences provided background for the novel Keep the Aspidistra Flying (1936). As well as the various guests of the Westropes, he was able to enjoy the company of Richard Rees and the Adelphi writers and Mabel Fierz. The Westropes and Kimche were members of the Independent Labour Party, although at this time Blair was not seriously politically active. He was writing for the Adelphi and preparing A Clergyman's Daughter and Burmese Days for publication.  At the beginning of 1935 he had to move out of Warwick Mansions, and Mabel Fierz found him a flat in Parliament Hill. A Clergyman's Daughter was published on 11 March 1935. In early 1935 Blair met his future wife Eileen O'Shaughnessy, when his landlady, Rosalind Obermeyer, who was studying for a master's degree in psychology at University College London, invited some of her fellow students to a party. One of these students, Elizaveta Fen, a biographer and future translator of Chekhov, recalled Orwell and his friend Richard Rees "draped" at the fireplace, looking, she thought, "moth-eaten and prematurely aged." Around this time, Blair had started to write reviews for the New English Weekly.  In June, Burmese Days was published and Cyril Connolly's review in the New Statesman prompted Orwell (as he then became known) to re-establish contact with his old friend. In August, he moved into a flat in Kentish Town, which he shared with Michael Sayers and Rayner Heppenstall. The relationship was sometimes awkward and Orwell and Heppenstall even came to blows, though they remained friends and later worked together on BBC broadcasts. Orwell was now working on Keep the Aspidistra Flying, and also tried unsuccessfully to write a serial for the News Chronicle. By October 1935 his flatmates had moved out and he was struggling to pay the rent on his own. He remained until the end of January 1936, when he stopped working at Booklovers' Corner.

did he do anything there besides the bookstore
He was writing for the Adelphi and preparing A Clergyman's Daughter and Burmese Days for publication.