With no disrespect meant: I find the currently available videos for BIAB so tedious and slow to get to the meat of the matter they are almost unbearable.
The pdf help manual is more helpfull to me overall.
A BIAB for dummies would be great however. The manuals for Reaper published by LULU are relatively inexpensive and thorough. Spiral bound and the print quality is good. The mixing manual and the Using Reaper were 360 pages and at the time cost $12.95. I believe their prices have gone up recently .
Another option might be an online Wiki with user submitted input. Mac would be an excellent caretake imho.
Here a link to the Reaper Wiki.
http://www.cockos.com/wiki/index.php/Reaper_Documentation