I've always had an interest in TEOTWAWKI(the end of the world as we know it) - movies, books and television. There has always been something about this type of story that really drew me in. This is where I got started. These stories would spark a thought "What would I do if....If they would have just done this......what do I have that could get me through that"?
If you are reading this, you most likely already have this interest. Well done. On to step two.
2 - Learn why Preppers do what they do
Why should I have extra food and water on hand? Why should I have a bug out bag? Why should I learn survival skills?
These are all questions you need to ask and get answers to. If you don't know why you are hoarding water in your basement or learning the basics of firestarting, then you probably won't keep that passion or do those things as effective as you could. How do you find out? First off, you've come to the right place. I suggest starting with doing what you are doing - reading.
My next suggestion is podcasts. Yes, the first podcast you should listen to is The Casual Preppers Podcast. These dudes got it going on. But, after you have downloaded every episode and shared with your friends and family, there are a few others I would suggest. I really like The Survivalist Prepper Podcast. Dale knows his stuff and isn't arrogant about it. It is a really good resource. I also like Realistic Preppers. The production value is a little lacking, but they really talk about prepping and survivalism in a "Realistic" way.
3 - Get Started
Step one and two are in the books. Now what? Start prepping. Duh.
I suggest the first thing you start with is some sort of bug out bag or 72 hour kit. This is a really good starting point for everybody. We have a podcast on this very issue here.