Im a quite skilled pilot, here's my tips:

Choppers:
1 The basic flight is easy, its already been stated that you should go low. And that is the best thing to do, low and fast. If you have problem hitting stuff while flying low, you havent trained enough. Simple as that!
2 AA avoidance, use obstacles as cover. If youre in open with some decent altitude, pull the nose up and hit the flares, and do a backwards roll. The flares fly at the speed you fly at, and by doing this, any AA infront/flanks of you, will hit the flares 99% of the times and the last 1% miss you and the flares ;-) - Then ofcourse speed away at low altitude, and when youre low and keep getting aa, pull up nose to fire flares, then they will get up the air, instead of hitting the ground where they are useless.
3 hoovering, here im thinking of attack chopper blindfire platforms or hoovering over a river to do a quick drop off. It can only be achieved by training - But if you dont have a very good joystick, use your mouse. Cause a chopper stick is 3x as long as a joystick. This means its alot more sensitive and easier to cooperate with. So unless you can get your settings right its hard to be able to hoover properly, and on top of that, if its not calibrated properly, you wont be able to keep it still. All about the quality of joystick. And the manuever in it self, training.

Planes:
1. AA avoidance, when you get lock on from ground, fire one flare as you start pullingnose up, then start doing a barrel roll while firing 3-4 flares. The flares from the plane, only goes one direction, if you do a roll they will split up and create a "wall" of flares instead of just a line - this will up your chances of the AA sight/path towards you, will be intercepted., Rince and repeat until youre out of trouble. A 3 minute landing procedure for flares is better than a 20min asset downtime, for not mentioning the ticket loss...
2. AA avoidance, air-to-air, this is a tough one, which is hard to practise in PR. Depends on what plane your in, and what plane is against you. They can be roughly catagorized as bomber and fighter. Dog fights as they are refered to, is all about out manuevering your opponant to get up his tail, instead of opposite. Only way you can master this, is by getting a feel with the plane your flying, know how the deaccelleration works best with fast turns and rolls. When youre being followed, its about giving the guy behind you a hard time following. Best thing ive noticed doing, is immiedietly, doing the roll while firing some flares, then pull hard to either 9 or 3 o'clock, for the to fake it and going for a vertical loop. And in that loop get his position and try getting in his path.
3. non laser bombings, PRACTISE PRACTISE PRACTISE :-) - took me ages to get the drop bombings from 2.5k altitude right, but its very rewarding when you get it right. I use the tactic going to 3.5k altitude, when nearly above the attackmarker'd target, fly directly towards ground and match pin a little below target, drop bombs and get away. Takes a spotter on a training server to get this right, with some feedback. And ofcourse your memory of what pin position you dropped at, what speed and what altitude you were at.

Good luck with the flying! On my youtube channel there is a few vids of the attack choppers, but none airplanes. youtube.com/user/twz87

( Mind you some are older pr versions with different AA than today, in cobra/apache I like to be up above the "fog" limit in the skies, so that me or my spotter cant see the ground, but enemies not see us neither. Then have a spotter putting markers or laser targets for quick strafing runs. )