Don’t worry, maybe my instructions are just not that good 
I will say I’m confused when you say you just installed Rails and can’t access your DB. Maybe it’s all different because it’s an older version, but I think I’m out of my depth now too.
Anyway, once you’re in rails, the prompt should be something different, so from your output, it looks like you aren’t in the rails console yet.
I don’t even think you’re in the actual container. Have you done ./launcher enter app?