I just finished Operation Icestorm and downloaded the Beyond Icestorm PDF. I'm excited to get into the larger world of Infinity but I'm a little overwhelmed/confused about how Organized Play works and where to find scenarios and campaign rules. I understand Paradiso is at least a campaign but that it largely doesn't work with new rules and snowballs really easily, making it a less-than-ideal experience. It also seems that Organized Play is largely scenario based and might have an overall community-affected narrative a la Legend of the Five Rings.

So I guess my main questions are:

1. Is Paradiso still the official campaign system? And if so, is it enjoyable? Are there any community-created campaigns that are regarded as preferable?
2. Where do I find official missions/scenarios?
3. Is there an archive of Organized Play scenarios / seasons so that I could start at the beginning and play through the story, if that is in fact how OP functions?