if your just going on a trip, hire a guide if you want to get into the backcountry. there really is no point in doing a course or buying equipment if your just going on a trip. if you think you want to get into the bc scene seriously than those things might be worth the investment, but definitely go on a couple guided tours before you venture out there on your own. the most important thing in my opinion is experience. once you have many days under your belt, a lot of beacon and route finding practice, and you know the terrain your getting into, thats when you should go out alone (without a guide i mean, you need a partner of course). books are great, and they definitely open your eyes to things you would never have thought about, things even your guide probably wont mention to you, such as group dynamics and group related factors. some great books i have read and recommend are:
Backcountry Avalanche Safety - Tony Daffern
Backcountry Skiing, Skills for Ski Touring and Ski Mountaineering - Martin Volken, Scott Schell, and Margaret Wheeler
The Avalanche Handbook - David McClung and Peter Schraerer (you wont understand a lot of this unless you have a basic understanding of physics, chemistry and engineering. this book is often referred to the avalanche bible. unlike other books i have read, this book has a really good chapter on the psychology of backcountry travel that i definitely found helpful and informative.)
that being said, these books are no substitute for proper training and experience, they should only supplement them. as for information in magazines and on the internet, i often find that these sources lack the depth and professional analysis that the aforementioned books do. so i would stay away from them.
take what i have said with a grain of salt. ive only been skiing the bc for about two and a half seasons so by no means do i consider myself an expert on the subject.