1) On the plane, n1k2-J, i see it had 4 20mm guns. How do i enable heat seeking warheads on the bullets of the nik2-J's 20mm's. It is probally very simple, and you just have to press a key or somthing.
The Niki's heat seeking bullets are specialy modified to target the Fw 190. Against this plane, the bullets (if fired under the correct conditions) will go straight to the source of heat and produce an oil leak from the engine.
2) I see some planes have rockets. How do i make the rockets heat seeking? How do i make the rockets stealth?
The heat sensor on the rockets is activated by firing at ranges of under 50 yards. At this range, you will find them extremely stealthy, they'll never see them comming.
3) On RGAF (Royal German Air Force) planes, i see some of them have bombs. How do i make these bombs lazer guided? I am having trobule aiming them
There are no First world war aircraft modlled in this sim. You must be thinking of the Macchi. This Aircraft does not in fact carry bombs, explaining your lack of success in this endevour.