As for your briefing a weapon choosing needs, I suggest downloading a script ediotr of some sort like Chris's Script editor. In those you can make briefings, weapon selcs easy.
As for obj complete:
In trigger or something that says west not present
put in the activation : "1" objstatus "DONE"; hint "your obj is complete thats it you win"
and walla!
Then in end trigger
west not present
end #1
activation: hint "Mission complete!"
then go to effects and choose camera stuff and sound.
There you goes...:thumbsup: