My Slayer task on RuneScape is 51 Rock Slugs, where do I go and what do I need?

I would like to know the armour exactly, I have Rune and Dragon Hide only (Green). I would like to know the weapons. And what food to bring, I have 400 Rock Tail if that's good. I would like to know where they are. And what I need to kill them, thanks :)