The Party for Socialism and Liberation has been, as part of its Liberation School website, been publishing study/reading guides and class material for Marxist works. I cannot recommend these enough as aids for reading and understanding the works in question.
- The Communist Manifesto by Marx and Engels
- Left-wing Communism: An Infantile Disorder by Vladimir Lenin
- Capital by Karl Marx
- The Right of Nations to Self-Determination by Vladimir Lenin
- Imperialism: The Highest Stage of Capitalism by Vladimir Lenin
- The State and Revolution by Vladimir Lenin
- What is to be done by Vladimir Lenin