i want to make a really good ghostbuaters 3 script mostly for fun but i dont know how to go about it

Well, think about what you already know about the Ghostbusters. Than possibly who you would like the boys to go up against. Perhaps also if you want new characters. Like talks of having new Ghostbusters because the guys need help because they're old. Just write something you would like to see. Maybe use the ideas that keep floating around here on the message board. Many people have many ideas and it is quite possible to use them for a script like GB III.
That's all I have to say. I hope this helped some.

although i'm not really into the whole fan-fic thing, i've been wanting to write my own GB3 fan script for quite some time, mainly just to get all my ideas down on paper.

if you're unfamiliar with script writing, i suggest you look at the GB and GB2 shooting scripts for research. read them, see how they're written, then you should have no problem writing one of your own.

the scripts can be found here…. http://www.screentalk.biz/gallery.htm

i have some ideas it's just the beggining which im finding hard writng

buy either

Screenwriting by Syd Field

or if youre feeling really ambitious

Story by Robert McKee

Either will jumpstart your ideas.
nick