Fastdl? How do i get it to work

Me and my friend are hosting a darkrp for gmod and we need fastdl so we can do custom maps and keep everyone on the server. If anyone could help me get this working that would be great i have teamviewer and i change all my server files via ftp please help.

Basically, get a webhost, upload files, and set sv_downloadurl “http://blahg.com/gmod”.