I’m currently trying to use this program to make my own moba game, i am trying to figure out how to make a still tower that will shoot me if i get too close, not when it can see me, but when i get inside the towers range.
Welcome to the forums. Making a MOBA is very difficult, and more if you’re a begginer. You should start with small games, and then, when you get enough experience, do it:
See: [“Where to start”](http://forum.unity3d.com/threads/204736-Where-to-start)
http://forum.unity3d.com/threads/184797-The-answer-to-every-Can-it-be-done-and-I-ve-lost-my-way-post
Way too ambitious for your first game. Start simpler.