Contribution to the Critique of Political Economy is pretty easy, good bones, but Marx revises a lot of his views later, by Capital he's abandoned concepts like "Lumpen Proletariat" and the idea that socialism can only be achieved after a capitalist developmental phase.
Socialism: Utopian and Scientific by Engels is one of the best intro Marxist works: comprehensive, practical, and easy to follow.
Wage Labor and Capital is another short and pretty digestible work by Marx that lays out a lot of the economic ideas without a deep dive such as Capital. But "economic Marxism" is kind of its own kind of confusion, and Capital shouldn't be read to understand his economic ideas but his actual methods.
Marx wrote for the workers, not the academy, his works can be difficult but they make more sense as someone trying to learn more to understand about their lived experiences of exploitation, than an academic view that only wishes to compete in an intellectual marketplace, rather than empower the working class to liberate ourselves and each other.
But Marxism isn't a book to be studied or a method to be applied. You can be a Marxist without ever picking up one of his works, I think there are a lot of "organic" Marxists who know through experience but doubt through shame and misinformation. Marx ultimately wanted to teach us to understand material conditions, but without the various distortions that have been introduced by bourgeois philosophers (some of them even considered themselves Marxists!)
Put yourself in touch with people who can get you involved in actual work in your city and community, doing real social work with the people who need supported. You'll get an education from the work and take your time with the written works of Marx and Marxists to let it enrich your actual work, not define your idealistic beliefs.
After all, "The philosophers have only interpreted the world, the point is to change it."