On the website of 3dtotal.com, go to the shop and browse for an ebook called 'Elements V1' and there is also a second edition.
These ebooks are of the same quality like ImagineFX but with a better price.
On http://www.2dartistmag.com/3dtotal/  you will find ebooks for 2D too - there are Lite versions free for download so you can check out the issue before buying them. With a price tag of 4.50 dollar, it is a steal!

Also, do a search on Deviantart for more free tutorials on digital painting...
Have fun!
Jacqueline