This is painfully broad and there’s so much more information we need to even begin to provide you with reasonable advice.

I would refer to the pinned post in this forum, and then provide more specific questions if you still have them. There’s also plenty of online guides and tutorials related to streaming that referring to any of them would be a good idea. If you have more specific questions maybe related to capturing gameplay or utilizing a timer like LiveSplit, then we can assist you with that.