When you start the game, you will be put into a surrealistic landscape. The view is from the cockpit of your bi-plane. Immediately, you will be jumped on by enemy units. You will know an enemy unit has appeared because of the sounds the game makes. The joystick is pretty sensitive. This basically means you don't have to push it hard in order to get your plane to move around. Also, remember that the game is set up like an actual plane.
Try to keep your altitude as high as possible. This gives you a better chance at 'jumping' enemy air units. In addition, it will allow you to be able to keep with them longer ensuring a better chance at a kill.
If there are no enemy planes around, you can go on strafing missions to take out a few of the enemy ground units. Be very careful when you are doing this since the terrain is pretty mountainous.
At the beginning, you will only encounter one enemy plane. As you progress through the game, don't be surprised when you get attacked by three or even four enemy planes at one time.
Learn how to do deflection shooting. Deflection shooting is a method of shooting where you fire your shots in front of the projected path of the object you are trying to hit. In essence, it forces that object to "run" into your fire.
Practice doing evasive maneuvering starting with the basic dives and climbs. Then add turns to these moves. This will definitely come in very handy later on in the game when you are confronted with a large number of enemy units (both ground and air).
You will see the enemy fire that is aimed at your plane. The bullets look like diamonds. They are easy to evade but you may have to do some tight turns if there is a heavy volume of enemy fire coming at your plane.
If you don't take out an enemy plane while it is heading for your plane, it will get behind you. This presents a very dangerous situation since you will only have a couple of seconds before you are shot down. You can evade the enemy plane :
a) If you are too close to the ground, immediately climb and roll to the left or right. By doing this, you actually cause your plane to slow down and the enemy plane flies under you giving you another opportunity to shoot him down.
b) If you are too high, then you can power dive and roll left or right. Just watch out for the ground (which will be coming at you fast). Before you get to the ground, do a power climb and follow the advice in the first part.
Blimps present a unique challenge since they don't move very fast. This means you will need to take them down on your first pass since you travel much faster then them. Sometimes the blimp will present you with a "head-on" look. This makes it harder to hit since it makes itself into a smaller target.
While 'hunting' for enemy air units, it's usually a good idea to do a gentle roll from side-to-side. The reason for this is if you get multiple enemy air units, you can fire off a burst and knock more then one out of the sky. This helps even the odds up considerably.
Don't keep your finger on the gun trigger too long. Your guns will overheat and it takes a couple of seconds for them to cool off again. That couple seconds could be the difference between life and death.