You need to use hills if there are any and utilise the roll rate & inertial guidance of the hellifires. You can’t do much anti air work with western helicopters but either way most air will be on your side so it isn’t that big of a deal. As far as heli vs heli goes forget it.
If you want to take my advice (I have limited experience using western helis), target enemy sams as much as you can, leave the MBT for the end or completely. The pansir gets overwhelmed fast due to it’s buggy tracking radar. This will greately help the mostly braindead USA cas players do their job.