Setting up my computer

This is a little update post from my last one. This time it's about installing Windows and realizing I have absolutely no idea what I'm actually doing. ☺️

I've looked through countless videos on YouTube but realized they're all extremely different from each other which makes me very worried to just pick one, install windows and hope everything is okay.

So I've decided I can just ask the wonderful people on this subreddit for help on how to properly set this thing up. For anyone's information, I settled on the NVIDIA Quadro K1200. This is TEMPORARY. I plan to buy something much better that will hopefully last much longer. I also have a 1TB Hard Drive, a 128GB SSD (this is where I want windows installed) and the main machine itself, the DELL Optiplex 3060 SFF.

I have a separate computer and USB to help do this, I am prepared for war and/or hell. I just need someone that can run me through the process. My only ask is that you be as detailed as possible while also being easy pretty to understand. I'm new to this so I might get lost easily.

(I was going to ask AI but I figured a human response might be more trustworthy)

Thank you!