Word of advice: Never try to be TOO ambitious. Stick to what you know, and what you can produce. Baby steps. Start small, then gradually (slowly) improve by challenging yourself with one new thing.
Your surface map looks good, but there's a ton of bugs. You need to learn to use the tech items before trying to make a cave. Caves require scripts and code; you'll need to link an entrance map and an enter map. If you can't do that stuff on your own, then don't bother making it. Baby steps.
Take your surface map, add the border hex blocks, then the screen blocks, then the exit grids. Once that's done start using the entrance blocks, then the wall blocks, then the solid object blocks.
If you try to over do it, or over challenge yourself, or get too ambitious your projects will eventually collapse out of frustration when you're breaking your mind over trying to figure out something you can't already. Waiting for help is even more stressful when it doesn't happen in a satisfying time frame.
Don't get discouraged, but remember that before you jump into the pool you'll need to learn to swim, AND before learning to swim, you'll need a bathing suit. Both require money, so you'll probably need a job lol... Baby steps.