I need some feedback / opinions

So im new to streaming, been at it for about a month, and in hindsight i didn't put enough research into it before I started. But nonetheless here I am, my questions are:

• What are the difference between single and double pc streaming? (Other than the obvious, number of pc's youre using)

• With a multiple pc setup, what do you use and or recommend to make this work? ( not so much the pc itself, but specific hardware i.e. capture card or anything else you could use)

• What do you think is most important when trying to start streaming? (I.e. discord setup, separate socials, full graphics setup, advertisement or anything else)

• What other tips do you have for a new streamer or someone contemplating to stream?

Thanks in advanced for any and all inputs, and I hope everyone has a great day 👍