Hi, you need to extract the files from the .rpf with openiv, create a folder in your resource folder with the addon name, inside that make a folder called stream. you will also need a __resource.lua. the files you extract from the .rpf go into the stream folder. then add the folder name to your server.cfg. with either start or ensure depending on which server you are running.
i new to all this myself. but this is what i have been doing.
Hope its of some help.
youtube is your friend. look up rib sosay. he has a lot of good help videos