Hi Mike,
I've been doing my research for a couple of months just like you want to do, and it's hard to know what to buy ...
I talked to a lot of people and Rosalind Gardner's website was written in a way which made me think she was a good person with lots of real info to share, I checked her out on the internet to see where else her name appeared, I got a recommendation from someone who'd used her ebook, and I bought a copy myself last week.
Incredible amount of info and so easy to understand!
http://www.superaffiiliatehandbook.com
I would also recommend an ezine with similar info which is free called Forget The Hype at
http://annamarketing.com/pops/splash.html
With both of these, you'll get a really good idea of what it all means.
Do plenty of research and work out what works best for you.
Good luck!
Teena