Getting started videos are now available here for both Windows and Macintosh: LINK (http://www8.garmin.com/learningcenter/training/basecamp/)
Plus new is the online help: LINK (http://static.garmincdn.com/basecamp/en/Default.htm)
If the maps are not showing up please ensure you have downloaded the latest version of BaseCamp: http://www.garmin.com/us/products/onthetrail/basecamp
Garmin has posted a new video on organizing your data in Basecamp.
Windows verson: http://youtu.be/fBYMir63X4M
Macintosh version: http://youtu.be/Fj42ksUXs_I