Assuming this isn't a troll....
#1) Why land?
In game value: perk points multiplied by 1.25
Stats: if you track kill/death ratio, it helps
Otherwise, be lazs and just crash to get back into the action quicker
Personally, I (and many others) like the satisfaction of landing a plane - I view it as a flight sim as well as a combat sim.
#2) Kill allocation
It's kinda f%^&'d in this game, but it is the same system for all. You will lose some kills, and gain others. Basically, the game attempts to assign each death to a cause. If you auger (like I do all the time) it just awards the credit to the nearest pilot. Sometimes he(she) deserves it because they suckered you too low, often they don't. I don't worry about it too much.
#3) Throttle keys
If you have Auto-takeoff on, then throttle is at 100%. You may have to use the SHIFT-equals (+) rather than the number pad +
#4) Spinning dives
Recovery is tough. Practice offline from about 10,000 feet. If you spin out at under 2000 feet you're dead unless you are VERY good. It usually takes me about 5000-6000 feet of alt to recover from a spinning plane. In the F4U I don't recover at all
Theory: spin is caused by one wing stalling, usually a high Angle of Attack at low speed causing you to stall and lose the ability to fly level. That wing dips and there you go... First thing you need is lift, so point the nose of the plane DOWN (this is counter-intuitive, as that ground comes up fast). I turn throttle off so I don't rip my wings off as speed increases. As your speed comes up, you now have enough airflow for lift, if you could only balance the wings. Turn hard rudder the opposite way of spin. That is, if you are spinning left, apply hard rudder right. If you can't figure out which way you are spinning, try both ways and see which gets results. The aim here is to stop spinning. As your spin slows, get ready to ease up on rudder input or another one will start
Once the plane has stabilized and is headed straight down, GENTLY (so as not to spin again) pull the plane level. A cheat at this stage is to hit X and let go; sometimes the auto-level will save your bacon.
The best way, though, is to learn when your plane is about to spin and stop performing the offending maneuver. Learn the telltale signs of an oncoming spin and stop just before that. You are probably yanking your plane around too quickly at low speeds.
#5 Bomber climbing
Bombers climb like pigs. The B-17 climbs like a pregnant pig. This is normal
#6 My screen goes all FUBAR if I ALT-TAB out, so I always quit, do what I want to do, and then log back in.
I am sure others will chime in here