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1.If I want to press P to pick up a weapon,what should I do?(I can't find threads about this)
2.If I want to weapons appear randomly(in a layer),what should I do?
3.If I want to press G to throw weapons on the ground(turn HUD into VWEAP),what should I do?

syh 1 - The use another method to pickup a weapon as when hitting a key is simple. Here is a link to just something like that....
https://forum.thegamecreators.com/thread/186330 Look at his scripts. You can easily change which key to use
by changing the "scancodekeypressed=x" code ( P is scan-code #25 )

2 - The only way to make weapons to "seem" to appear randomly is to have them "triggered" when a player moves into a certain area.
You can also use the "time delay" to appear settings in a weapons property settings

3 - You can't turn a weapon HUD into a Vweap, they are two separate entities/huds. But adding the commands "playerdropcurrent & removecurrentweapon"
will work just fine. Use "scancodekeypressed=34" to use the "G" key

Here is a link to the Syntax list with all the commands you might need
https://forum.thegamecreators.com/thread/180924

So if I want to the player to drive some vehicles,what should I do?

syh
Two choices, have the entity attach to player and offset camera to make player seem inside, or second, use a simple hud system.
The hud would be a total custom made and scripts. Doable, but all custom.
Make your vehicle, when player is near vehicle hide the entity and have a custom hud appear.
I made one with a steering wheel that would turn as player moved. With working dial indicators.