Your step 4 is to ask them on a date. Not to hang out as friends but on a real date.
You could say something like "I've really enjoyed spending time with you and am wondering if there might be more than friendship here, would you like to go on a date Friday? There's a show I think you'd like and I'd love to take you to dinner before?"
This step ensures that you're clear there is mutual interest. Then when you're at the show you know it's likely appropriate to hold hands and see if the spark continues, grows, or shrinks. If it continues you can take it as fast or slow as you and they feel comfortable with while checking in regularly by saying things like "I'm really enjoying this, would it be ok if I kissed you?"
You are the only one who knows your comfort reading social cues (and honestly, I still check in like this with my wife who I've been with for 16 years from time to time to ensure I'm not misreading cues).
Be up front and clear about what you're hoping for at each step and open to the possibility that they might be hoping for something different!
Yes, that's the problem. You should probably start by downloading the official raspberry pi imager and choosing a distro from there to install to the SD card.
https://www.raspberrypi.com/software/
There are other ways to find images and plenty that aren't available there but that's the easiest way to get up and running. You'll probably want to start with the default raspberry pi os and start experimenting with more customized os's later.