The wiki isn't indexed and is full of garbage. The forum threads don't exist anymore, even in the archive section. Maybe something is broken on my end but I think that is a resource we should have available for new agents.
I believe they're all still there. I don't think we had actual threads for the Missions, but Silverfox has a few helpful threads for 1-6. If you need any help, either do a Call For Help in game or join the IRC where people should be able to help!
Yeah, the ongoing missions subforum is a bit messy. There are plans to clean it a bit but it will take some time since the mods team is a bit short of time. But don't worry, in the following days me or another mod will create a thread to talk about archiving missions. @Silverfox you can use the threads I created for missions 12 to 15. I'll make sure to maintain the OP updated with tips and hints.
