welcome to the forums, @elmoguy666 !
make sure you remember to read the guidelines, it’s important!
sorry, i’m a little late.
you can use barriers and items to make buildings, even text with emojis! I know that Slim already sent inspo so that should help you too. you can also use terrains, build them up into a building-like shape. you can also put an invisible button by the door, which will teleport you inside when clicked. just make sure you have a teleporter inside too, of course! this will let players to exit.
here’s a guide on how to do platformers with buttons:
Guide by GimkitAdmin (idk how to put this without a link, i’m also new to the forums)
I hope this can help! If you have any questions, feel free to ask.