admiki

Here is what works with what

You need aiming station tab

Kinda selfish of you to expect others to spend time you are not willing to invest yourself.
Anyway. There is no procedure for that in Chucks guide. You need to jump to front seat, switch weapons down, wait for 3.5 minutes, switch it back up (you can use Petrovich for that) and after it warms up should be good to go.
My guess is that you turned away before closing sight and Petrovich did not manage to do it in time to preven gyro toppling. Never trust Petrovich to do that in time. Close it yourself (well, tell Petrovich to close before you bank).

exactly. you need to select target first with short right (default keybind is D).
After that you do all the lineup/tone shtick and fire

Get him into hover, switch to HB mode and set 0 alt. It will take some time, but he will land

No, it doesn't work that way. You can't make it transmit text-to-speech, you have to select a file. It has to be either .ogg or .wav type of file.
Take another look at that video at 1 minute mark.

Probably some corupted file. Run full repair.

All of your points, except 3, are de-sync issues.
As for your point 3, 18000 ft is not a hard line with on-off state. People can pass out from hypoxia at a lot lower altittudes and they can stay awake a lot higher. 

If you are using buttons (instead of axis) to move TADS, at first it moves slowly then rate of movement speeds up. That slider sets how much that "speed up" is.

Go to Apache/A10 tab and click on modifiers on the bottom. You probaby added those as switches, not buttons

Your CPG should have his ACQ source set to PHS. He just needs to slave TADS and it will point were you are looking. But, you can't look away until he deslaves TADS

Ah, OK, I get it now. I don't use that button. When you start boresighting procedure, cursor will automatically position itself so you can just use cursor depress on your collective.

If you are using buttons (instead of axis) to move TADS, at first it moves slowly then rate of movement speeds up. That slider sets how much that "speed up" is.

Both of you need to open voice chat window and enter same "room"

1,3 and 4 are all the one problem. I'm guessing you are running multithread version. Go to rearm screen and select another skin. You don't need to click OK, you can just choose another skin and then cancel, it will fix your problems.
2) for the Petro free fire, you still need to line up for him to be able to shoot.
Get that cross into small circle on your HUD and he will shoot, unless line of sight to the target is blocked

I have no idea why, I just know that's how it works
@bradmick @Raptor9 can explain it in more detail

Your first problem is that your sight gyros got toppled (you need to close sight when turning more than 60 deg or banking more than 30 deg). To fix this, shut down all weapons systems, wait for 3 minutes, turn them back on and wait another 3 minutes for them to allign.
For getting the tone, you need to press UP LONG. UP SHORT will allign helicopter laterally, long press will tell Petrovich to drop the nose towards your aiming point, but his piloting skills just suck. I find it easier to move sight up from the target until I get the tone and then drag missile down onto target.
Third problem- look above (besides, Hind really does not like to hover, especially when heavy)
Lastly, go to CPG aiming station tab and bind "aiming station joystick" axes.

No, both Petrovich and Apache George can only target units/structures put in mission editor.

If you have gone through bugs reports you would have seen that there is a problem where George puts LST into auto. You need to jump into front seat and turn LST off.

I think it went down. Also hitting power got some boost

TBH, I never tested it, but I think it would be set by George, unless you jump to the front before startup is completed.

Probably got corrupted during update. Do a slow repair.

And yet you have UB-32 pod on your left side. One thing that you need to remember, if you change something, game will keep it that way. So, no matter what the preset name says, if you changed that load in the past (even by accident) it will load that every single time.

GUV mode switch

Yaw AP is in heading hold mode. That is normal behavior.
You need to either turn off yaw AP or press and hold Y key.