Clara,
Would suggest Google Images as place to start. Enter "(Aircraft Designation) Cockpit" in the search string, an you'll find a wealth of images (photos of museum airframes, CGI, and pictures of in-progress model builds).
There are excellent published references available (Windsock Datafiles among the best), but you'll spend a lot of scratch in the process, if all you're looking for is cockpit details.
Regards, Rob