RB20DET vacuum hoses help?

[BLawson]

I've managed to sort out most of my vacuum lines and fuel lines by looking at a second parts-motor for reference, but there are a couple that have me stumped. I will attach a few pictures to hopefully help describe my issues. Not in order with the pictures, but here is what you are looking at.
1. I think this is the AACV? on the back of the intake. If not, I am here to learn. It has two lines beside it and one on it. The top one was blocked off, the bottom one goes to the Brake booster, I think. On the solenoid thing, it goes into a T fitting. If I understood correctly, this should go to the thing under the Throttle body? I have no idea what to call it.
2. The thing under the throttle body. Again, I have no idea what it is or what it does, so if someone cares to share some light on that feel free.
3 Two lines coming from the front/side of the intake facing the cam covers. one of them looks like it has plastic broken in it, like part of a T fitting or something.
4.My RB has two Pressure Regulators or so it looks like. I found the little vacuum thing on the front of the intake for the front FPR, but the back I'm not so sure about. If that's not what that is, please let me know so I can stop sounding stupid...
5. as stupid as it sounds, where does the vent thing on top of the cam cover go??

Please forgive me for these probably simple questions, but I have searched several times with no luck. Any help at all is greatly appreciated.Not sure How to Properly upload pictures

[driftersilvia240sx]

my brain hurts, figure out how to post pictures it should help