Aside from the book I mention below save your money and visit as many forums as you can handle. Invest your money in tried and true marketing tools that allow you to get to market faster.
Since you're already here, here's a good list of forums you
NEED to visit on a regular basis.
http://www.sitepoint.com/forums/
http://forums.digitalpoint.com/
http://www.warriorforum.com/forum/
http://www.highrankings.com/forum/
You'll probably find just about everything you're looking for there. As a side note I
will say the best SEO book you could possibly purchase is
The SEO Book. This is a constantly updated living document, which I highly recommend.