I need help with my game

Hi guys, i want to make a sandbox game with a story, but i don´t know how to start. What do you recommend me? Architecture, 3d models, i don´t know what to do first.
I have read the tutorials and the documentation but i need help to start my game.

That’s a huge undertaking, particularly for one person. Doesn’t mean you shouldn’t go for it - but start small, and complete something simple as a ‘proof of concept’ that actually works before you move on to the next stage.

Can you make a sandbox level about the size of a regular room, containing 3 cubes that can be manipulated and stacked on top of each other, for instance? That’s going to be quite a bit of work in itself, however simple it sounds.

Do you think a small game can be a room with an inventory and items?