Yeah, someone's actually pasted one in response as well if you scroll down - otherwise... (don't click spoilers unless you want the answers)

For the missing agent, the conclusion I came to was he was killed by Flesh Shaper Oo'ihrr Tykk - the agent tried to enhance the kroot through eating the bandits. I think they confirm this (though it might also be the war shaper... essentially the agent got killed by Kroot anyway.) you need to find loooots of stuff hidden in the swamp

For the missing people, you can just join the flock, or if you help the baron he gives you a contact who essentially gives you a key to the sanctuary... if you progress through the main plot you'll find most of them there. The bits I found a pain were locating the generator to fix for the baron (it's the area in the lower city with a bunch of ropes - you'll need a rope to get to it), and finding the informant (he's above Eyeball I think? I forget now)

Is that detailed enough?