It really depends upon you. Do whatever you want!
It could be a small hut, or it could be some Pixel Art.

HEAVY W.I.P FOR NOW

To publish the map, save and exit the world that you created, and then press Options.
After you press options, press Save World Backup.
Exit the world options, and then go to the main menu for Minecraft.
Press Options again.
Go to Resource Packs.
Press Show Resource Pack Folder, and then go backwards in the File Navigation into .Minecraft.
Press World Backups.
Take your world, and then set it into a seperate file for easier acess.
If you want, unzip the file.
Upload the file to a file sharing website such as MediaFire.
Finally, upload your map onto PlanetMinecraft with some screenshots, the description, and the link.

A few that I know about are kinda only limited to creative mode, however:

The Debug Stick

/Give [[Name HERE]] minecraft:Debug_StickThis allows you to edit the states of multiple blocks,
If you made some stairs but you want it to point a certain way that is obstructed, you could go mess around with the stick.
The Stucture Block
/Give [[NAME]] minecraft:structure_blockThis is pretty complicated, so I'll give you the Wiki Page.
In short, it allows you to save structures that you made to paste it somewhere else, kinda like a more complicated ctrl+c ctrl+v
The Command Block (if you didn't see this coming, I'm suprised!)
/Give [[name]] minecraft:command_block
Allows you to keep a command saved into a block.
If you keep on wanting to change it to day, it is recomended that you keep a command block somewhere that you go often.

/locate
/give
/help
/tp
/setblock
/placefeature * , **
/Clear
/DefaultGameMode
/daylock ***
/fill
/Gamerule
/Seed **
/Team **

---

/LOCATE
Allows you to locate a structure such as a Village or Woodland Mansion
/GIVE
Used in the previous question, it gives you an item that you can or cannot find in the creative inventory
/HELP
Allows you to see more commands.
/TP
Allows you to teleport to any given location.
/SETBLOCK
Allows you to set a block at a given location.
/PLACEFEATURE* , **
Allows you to place a given Mojang-Made Feature, such as a lake.
/Clear
Self-Explanatory, this clears your entire inventory.
/DefaultGameMode
Changes the default gamemode to whatever you chose. Such as | /DefaultGameMode Adventure | for making people who join your world not be able to destroy anything.
/Daylock ***
Makes it so that it is only day.
/Fill
Fills something in blocks from 2 different places.
/Gamerule
Changes a gamerule such as RandomTickSpeed and AlwaysDay
/Seed
Shows you the current seed of where you are. Useful for if you found some cool looking terrain.
/Team
Allows you to change the team bar.

*Only able to be done during the latest snapshot. (22W03A)
**Only available for Java
***Only available for Bedrock
Also see The Wiki Page, It says it far better then I do, I just build for fun and as a hobby.

General Building tips:

Minecraft Construction Handbook (Book) Amazon Link
Grain (Youtuber) Link
TBA