However, I have absolutely zero experience in construction, design, or really handiwork in general tbh.
I'm not going to try and talk you out of it, but I would recommend getting some practice building other things first. Every tool and technique has its own learning curve. If you're dealing with the learning curves for all of them, all at once, you are setting yourself up for a world of hurt.
Start small. Build a doghouse or chicken coop. Build an above-ground shed. Build a tiny underground storage space. Then take a realistic look at your own abilities, stamina, and commitment to the project, before you decide to make that leap.
And if/when you are ready to make that leap, post pictures so we can cheer you on!