Welcome to the forums and
Instead of making a hundred treads for some weird scipting questions im just gonna put them all in this thread.
Thank you Thank you Thank you
Question 1: Use this method - http://www.lucasforums.com/showthread.php?t=206642
Question 2: Use this function 'RemovePartyMember'
object oW1 = GetObjectByTag("your item);
iResult = GetIsObjectValid(oW1);
Use the first link to try and work this one out as well.
Question 4: Use the things from the first link and see if you can work out how to use IF statements to combine scripting and global variables and make things happen based upon them.