Ths is a big topic! We now have the marvellous Internet Archive
which makes it easy to look at the actual writings in the
but there are volumes and volumes of them. If you have never read any
actual Marx, you are in for a real treat because the style is superb.
It is witty, sarcastic and passionate and very critical. It is also
very learned, with asides in Greek and Latin, French, German, Italian
and Russian -- luckily, the assiduous translators have explained most
of the terms and tracked down most of the literary allusions.
Anyway, here is a menu of my own teaching material with my
favourite bits, all of them picking up on the 'methodological' issues.
See what you think: