It's not very intuitive but you actually have to sanction your event FIRST then you get the link to download the materials for the module. Which is a shame if you wanted to actually read up on the module and browse a few before deciding which you might want to run. There is however a decent listing of the LFR modules and descriptions if you google 'List of LFR modules', but of course that just gives a broad overview.
This place has the summaries in one place along with player and DM reviews http://gamerclubhouse.com/Module.aspx
Or do what I do and order a handful, download them, then cancel the game day.
Beware that that kind of thing can get your account flagged and your ability to sanction events removed.