If you are flying a russian plane, in the search phase it's better probably to use the ППС mode on your Radar. This gives you a better range of detection. You also need to scan the entire area in front of you. Point your antenna to the left, check the elevation, then center, and right in a contineous loop, so that you don't miss any targets that are not exactly in front of you.
When you see a target, first you should make sure if he's alone, or there are more in close proximity. So you don't lock the bandit just yet. But try to remember his position/spd/alt. Look out for other bandits, and when you're already close enough to engage and fire you're weapons, then you should lock and fire. Depending on the weapons you use, there is a different strategy you may employ, but basic advices are:
- After firing, point your nose off the target(but try to maintain the lock), don't just proceed ahead at full speed.
- Watch your SPO warning system. It will give you valuable information on what's the enemy doing and the weapons he may be using against you.
- Don't get too close if you're not sure what is happening, better be safe then sorry. My personal advice is to disengage and extend at a range of 15km or more to the bandit. This keeps your escape window open, any further and it shrinks significantly.
- If you're alone, do not engage multiple bandits, you may hit one, but you'll probably also get shot down.
The best advice is to join a well established online squad, flying the type of plane you fly. They'll probably teach you all about Air to Air Combat.