Face it, you're new at this, and it's a tough game.
So, to make the most of your time, and to see some success, try the fighter bomber role.
You'll get good gunnery practise on your straffing runs (BTW, dive bombing and rockets are hard to do properly), you'll be scoring points, and you'll be in the right place at the right time to catch 'em taking off
Which beats spending ten or fifteen minutes climbing if your fight only last 30 seconds.
Once you've dropped your ordinance, then you go hunting happy in the knowledge you scored some points, contributed to the cause and you're on your way to be a killer :-)