The Council on Foreign Relations offers a well-structured webpage segment called ‘How does the European Union work’ with a concise overview of EU policy making.
You might also wish to refer to the Commission’s webpage detailing How Decisions Are Made here.
A similar overview is available on the official EU website.
Prof. Noah Zerbe of Humboldt State University (USA) has published a well-made YouTube video on the EU legislative process, which gives a short (just over 6 min) overview.
Click here for a graphic explaining the Ordinary Legislative Procedure.
Information on the state of play of all dossiers under discussion in the OLP can be found on the websites of EUR-Lex and the Legislative Observatory of the EP.
The European Parliament’s OLP webpage contains useful and interesting information and statistics on the Ordinary Legislative Procedure.
Vote Watch EU is an excellent source of information on voting in the Parliament and the Council.