You may want to swing back to Principles of Communism as well as Socialism: Utopian and Scientific by Engels, then Wage Labor and Capital as well as Value, Price and Profit by Marx before getting into Lenin if you’re not confident in the basics of Marxism. Lenin is Marxism applied to early 1900s Capitalism, which has largely grown along the lines he analyzed and predicted (among numerous other analysis in theory and practice).
You may want to swing back to Principles of Communism as well as Socialism: Utopian and Scientific by Engels, then Wage Labor and Capital as well as Value, Price and Profit by Marx before getting into Lenin if you’re not confident in the basics of Marxism. Lenin is Marxism applied to early 1900s Capitalism, which has largely grown along the lines he analyzed and predicted (among numerous other analysis in theory and practice).