Well, you may want to use the Enter key a little more often in your post to seperate questions. That makes it a little bit easier for us to respond to it. Just a thought.
About where you put scripts once you save them. They NORMALLY go into the "FPS Creator\Files\scriptbank\user" folder. That's where it is recommended to put your scripts.
How to activate it in the game: Find the entity you want to give the script to, right click on it after it's been placed into the level, and a list of properties will appear for it on the LEFT side of the screen. Near the top of this list you will see "AI Scripts" in bold and three field below it talking about "Spawn", "Main", and "Destroy". those three fields hold three different scripts for that entity, and you can put the path to YOUR script into one of them.
There are numerous threads that attempt to teach people how to script, but due to how many people either do not wish to learn and/or would rather just ASK for someone to do a script FOR them, not many people have devoted the time to writing tutorials for scripting. I have tried writing some very simple, VERY in-depth tutorials for very NEW scripters. You can find them if you go to the link in my signature.
Sorry, but unless I know what KIND of learner you are, there's not much of a way I can teach you.
The one and only,
~PlystirE~