When it comes to bantering, it's mostly just talking about what you're doing. To get started, you will do a lot of this.
"I'm going to peak this corner and see if anyone is sniping."
Peak corner.
"Ok, we are good. I'm going to push up to that building in hopes no one is there."
Push up to the building. BLAM!
"Chat, where the hell was that guy hiding. He has to be hacking."

It's way more manageable once you start doing it. The hardest part is doing that while you have 0 viewers and not getting down on yourself. Even if you have 0 viewers, you have to talk and interact like people are watching for the new viewers that pop in to not seem downright dull.