Setting up a beginner live streaming studio

Hey everyone, I need some help setting up a live streaming studio.

I’ve built a football community on YouTube and other platforms and now want to start doing live watchalongs for football games. I’m planning to stream to multiple platforms at the same time. I know I need OBS, but I can’t find any clear tutorials that explain how to properly set up the camera and laptop etc.

I’ll be streaming from my sofa and want to be able to read the live chat on my phone or iPad so I can respond to people in real time during the match.

Can anyone link me to a good step-by-step video or guide that shows how to set this kind of setup up?

For gear, I’ve got a MacBook Pro and a Nikon D3400. What exactly do I need (capture card, cables, software, etc.) to make this run smoothly?