To be quite blunt three paragraphs just isn’t enough for this broad of a topic. Are you more interested in his personal life or his political life? I’m sure others can recommend some proper biographies but i’ll just give you two sources that look at Lenin from very different perspectives: one is “Reminiscences of Lenin” by Nadezhda Krupskaya which gives you a good impression of who Lenin was as a person rather than as a purely political figure, the other is “History of the Communist Party of the Soviet Union (Bolsheviks)” by Stalin, which of course features Lenin very prominently since he is inseparably tied to the history of the Bolshevik party, arguably his greatest political achievement as the revolution could not have succeeded without the party and neither could the Soviet Union as a state have been built without it. Also Lenin was a prolific writer and contributed enormously to the development of Marxist theory with works such as “Imperialism, the Highest Stage of Capitalism” and “The State and Revolution” so one of your paragraphs should definitely be about his profound impact on Marxist theory.