I suggest that you read some historiography. Look for modern editions of the following -
EH Carr, What is History? Marc Bloch, The Historian's Craft Fernand Braudel, On History Peter Geyl, Debates With Historians
Richard Evans wrote the introduction to the latest edition of Carr, and there are two volumes of essays by young historians responding to Carr.
Maybe look at some game-changing megabooks such as Braudel's Mediterranean, Keith Thomas' Religion and the Decline of Magic, EP Thompson's The Making of the English Working Class, and Niall Ferguson's The Pity Of War.
I also suggest Empireland, Longitude, and Stalingrad.
Skip Das Kapital and read instead The Eighteenth Brumaire of Louis Napoleon - Marxist history in a nutshell. Have a look at this for some insight into the history of history at Oxford -