OP, you should follow the advice of >>2 and do more planning. Start small, and once you have a clearer idea of your design/story/assets, the choices you make over the engine and implementation should come easier. On the one hand, you don't want to open the development environment and get lost because of lack of direction. On the other, you want to avoid getting carried away by trying to add too many features you didn't plan for and getting lost that way.
But where will I get the image/art/sprites for the tiles?
Find free assets, buy existing assets, pay artists to create assets, or make assets yourself.
Free options:
https://itch.io/game-assets/free
https://ambientcg.com/
https://kenney.nl/