From this link:

http://www.garrysmod.com/?dont_buff_my_pylon=803

Where do I extract the downloaded files to? I thought there would be a read me but no, there was not with the download. :/

Any help would be much appreciated, thankyou.

I asked a friend on steam who uses this alot she said:

"Should be where the garrys mod folder is in steam, and then models. It should even say where he downloaded on the website,where to put it.
Or if he downloads it it will show the file names and he can drag it in."

I assume this is what you want using the site you provided, not so sure as I don't use it, you could have at least looked though. =/
http://wiki.garrysmod.com/?title=Addons_For_Dummies

 

Cool, it worked. Thanks man ^_^