Russ's blog is hands down the best user guide to Family Tree Maker. Although the site usually refers to the Windows version, FTM2014 and FTM3 are almost identical on the backend, so his instructions work for both. Russ covers a wide range of How To's and troubleshooting issues and is very responsive to comments on the blog. I use this resource instead of Ancestry's FTM helps.
Russ Worthington's FTM Blog
Russ Worthington's FTM Blog