For Dzogchen, both the methods of Buddhism and the methods of Bon are suitable, which may not take so long. That's why the two are mixed up here.
For now, here is an Audio Podcast that has good quality meditations (meaning the meditations are a little longer here) and instructions. There is also a text file for each.
Here is a selection of the books or the shorter guides, which can either be read on the web as Html or downloaded as a PDF file (or both).