Ali Edwards had a geat series on Digital Scrapbooking. Many of her posts are useful for hybrid scrapbooking as well, since she outlines things like how to download, save and open digital files. Also be sure to check out the Hybrid Scrapbooking category on her blog.
Many of the sites above also offer free downloads from time to time. You can also find free digital kits at most digital scrapbooking sites. Here are a few to get you started.
Also consider signing up for the newsletters from the sites, to get notification of specials and new freebie releases.
Enjoy the journey!