Well I can tell you right away that Warbands is not at all dead content. Thousands of people show up in friends chats every 7 hours to do them.
A good starting point is knowing when a warbands wave is about to begin. They start every 7 hours, and can be timed using the http://www.warbandtracker.com.
30 minutes before a wave starts, friends chats will be posted on the website which are hosting warbands in the upcoming wave. They may list what gear they expect you to use on the tracker, otherwise standard gear is level 50 torso/legs/helm + level 70 weapon of matching combat style (using batwing hood/torso/legs + polypore staff is a common setup).
Each host has 1 friends chat that they use and the owner of the friends chat can add up to 40 people, at which point the chat is closed (set to only friends or higher rank can join). At the 30 minute point you must join a chat and prepare to not be added, but listen to whatever the ranks tell you to do in case you are. There are hundreds of people trying to get into each chat, so be patient and keep trying to join until you get added.
After that point, listen to whatever the ranks say and you should be good to go. Warband camps can be located at one of three locations when they spawn, which are:
ELM - East of the lava maze - Make a waka canoe at the edgeville station and float it into the wilderness, then run slightly north to reach the camp.
RDI - Red dragon isle - Use a games necklace to teleport to the corporeal beast cave, then run directly east until you reach the camp.
DWF - Dark Warrior's Fortress - Run from Quercus to level 13 wilderness north of edgeville monestary
I think that should cover it, Good luck