Good for you man! Make sure your computer can handle it, because mine cant really :/
I am going to be streaming me questing tonight. I will be doing these quests:
RFD the entire thing, Quiet Before the Swarm, and A Void Dance.
System Alt delete
open teh processes and Close every thing that is not helping you stream or runescape
Then set high priority to both the runescape and the stream
4gb ram should be big enough to stream and play...