MgrHavoc

Well I am NEW to scripting and have been teaching myself over the last month. Watched almost every video and forum tutorial that is out there. I am having difficulty figuring some things out. I am trying to get a loot spawn script that I am going to use for a mod. I want it to spawn loot in proximity to the player (say 300m) and then remain for 10-15 min after said player is out of the area before being deleted, but I am having trouble figuring this out. I am using this script in this thread as a template to get started and making changes to it as I figure things out. If someone could lead me in the direction I need to go or give me some hints that would be greatly appreciated.