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You may be interested in Hemming's Conquest of the Incas, or MacQuarrie's Last Days of the Incas. Both are treatments of the historical and archaeological sources in such a way that discusses Pizarro's contributions and where he lost control. In short, he wasn't exactly silver-tongued like Cortes was.

There are a few chroniclers who discuss elements of Pizarro's conquest and the early years; specifically he had a cousin, Pedro Pizarro, who fought and aided in the conquest. However, that's in Spanish, so Hemming and MacQuarrie may be better bets for a school paper, especially as they incorporate these sources into their narratives (which are very interesting).