not so susah woh... first invert mouse

MOVE FWRD
hit W to fly up, mouse forward to make heli nose down and heli move forward (reminder.. heli slow ..dont expect like jet)

TURNING LEFT/RIGHT
once u get the inertia, BEST way to turn is hit A (left) or D (right) ALONE without W.

ADVANCE MODE TURNING
IF you pro u can fast turn using A/D + W + Mouse+right/left (stabilize) ... once u master this.. u gonna love play heli esp in MP...

Also when fight with heli/jet(especially) use W or S to go upper or lower altitude/level...
Best to fly near mountain/cliff in MP

I always in vehicle mode not 3rd person view UNLESS u wanna parking or drop your squad to target base OR to find enemy jet/heli only.

U will get through with experience.. its really worth it especially when u able to 'escape' crash.

Good luck