I don't really care about spoilers, actually.
I only got into KH about a year ago, so I never had to deal with spoilers, for the most part. I didn't even go online until then, either, so I didn't know KH existed.
However, I will probably keep myself scarce around here when 358/2 Days comes out, because that's the only one that I really want to play. I want to play Coded, but I could never afford to buy a cell phone that would be able to handle the game, or the game itself. I'm kinda cheap. I don't really care about getting spoilers on BbS, because I'm not as interested in their part of the story.
So, all I can suggest for you, just as everyone else has, is to just avoid forums and any place that could give you spoilers until you're done with playing yourself- or learn to deal with the fact that people will post spoilers as soon as they hear about them and you will find out if you stay on.