Practice like crazy in the tutorial, it will help no end. Spend hours in there if need be.
Learn how to control the aircraft for one, sounds obvious, but it can be pretty damned hard at first.
Learn how to bomb, start by using vehicles and gun emplacements as targets, start slow and low, then work up in speed and then start to dive bomb.
Tight turns are a must, so come off the throttle until you are almost fully turned, then back on it again. Time it right and the opposition will struggle to shake you.
Go high, go fast, I call this a Penny Benjamin - No points for guessing where I got it from.
When high and fast, flip over, off the throttle, push to go down, then just as the plane is vertical, pull up, and you just might be behind you oppenent.
Sy, I'm sure you'll have a fair bit to add, you're definately a better pilot than me.
Dont bother with the middle class, (they're nobs

Do give a ride to teammates, vehicles can be a rare commodity sometimes, and the maps are friggin huge if you have to walk it.
Keep an eye out for AA guns, they destroy aircraft very easily, and if you see enemy on them, kill them.
Will add more later.