Stream and start Youtube?

Now and then I would like to stream something and upload a few videos to Youtube.

So far I have recorded and cut it directly from the ps4 and streamed it.

But now I want to buy a laptop and everything I need for it.

I'm still a beginner in the field

Do you have any suggestions for me and what else I need?

Laptop, StreamCapture, Ps4, editing program

That's what comes to mind now. You can also suggest devices or programs to me.

I want to upload Call of Duty music montages on Youtube

You have actually already listed the most important ones, I would recommend a capture card from Elgato and if you want a better sound you can still get a microphone

And why from Elgato?