I think Wage Labour and Capital is a much better introduction then Value, Price, Profit. It focuses more on wage labour and capital as a social relation, while Value, Price, Profit is more about laying out economic laws.
And I think it's a good idea to start with the last chapter on primitive accumulation + chapter one. I think these are the two most important chapters.



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Allow me to be the voice of dissent and say, "stay away from Cleaver's dubious book."
Cleaver's positivisation of the proletariat and desire to subsume non-valued spheres to the logic of wage labor and the value form (i.e., the demand "wages for housework") shows that he hasn't really grasped Marx's negative critique of the categories of political economy.
To be completely honest, I think Cleaver enjoys such popularity in the age of the Internet because many young north American anarchists encounter Cleaver's work on the web when they're coming out anarchism and into Marxism. He's often their first and only introduction into non-Leninist strains of Marxism.
So much so, that he's even managed to turn what in Europe is merely a vague term for extra-parliamentary leftists, "autonomist," and actually create something called "autonomist Marxism" out of it!
If you want a guide to Marx, you could do much worse (and you would be doing that if you used Cleaver) than consulting I.I. Rubin's Essays on Marx's Theory of Value.
Freddy Perlman's short pamphlet, The Reproduction of Everyday Life, is also quite nice.
If you can read German, Michael Heinrich's book Kritik der politischen Oekonomie: eine Einfuehrung, is invaluable.
Finally, I'm rather fond personally of John Holloway's Change the World Without Taking Power as a bridge between Marx's mature critique of political economy and some other sophisticated social critics.