Learning the programming code, etc

I have been making a game for many years now but, all I’ve been doing is designing basic information on paper and on Google docs. The information I know is this: pictures, help & options, weapons, a few vehicles, space ships, a few characters, a little bit of story with dialogue (but that will be made last because, for a long while, it has been a mystery simply making the story. But also, most importantly, not promoting plagiarism), and a few other things.

Mostly what I’m asking is, can I have some help making the game? I mean, I don’t want to go over it too fast, but I mean; most of my game is already done. Except-- learning how to make a game. (its not programmed just yet is, basically what I am saying. I do have Epic Games Launcher Installed but not enough space to download all the updates) Currently, which, I don’t need to explain much about-- basically I need another computer. There’s just not enough storage space. Can you get a USB portable device to get more storage (for the computer-- literally) or does it not work like that (keeping information but not increasing storage for the computer)? Honestly, I need to know so I don’t spend so much money on a computer and time, just… not knowing how to program and, getting things imported into the digital parts of the game. I am very new here.