Before building in Minecraft, it's a good idea to get familiar with the different controls and commands in order to fully understand what one might be able to do with the popular sandbox game.
For instance, perhaps it's using the mouse to look around the world, and using the "W," "A," "S," and "D" keys to move forward, left, right, or backwards, respectively.
The Minecraft command to fly is to press the spacebar twice while in creative mode. Thus, if in another popular Minecraft game mode, survival mode, you'll need to enter the command /gamemode 1 to go to creative mode, and then press the spacebar twice in order to fly.
Fly: press spacebar twice
Fly higher: press spacebar while flying
Descend: hold the left "Shift" key
Besides flying being cool and fun, there are a number of different scenarios where one might find the need to fly! For instance, let's say a young Minecrafter is building a maze, but how are they going to know if that maze has enough twists and turns to be one that offers entertainment value? Flying helps with that overhead view!
Use the left mouse button to break the block you're aimed at. (The block you're looking at will have a black outline around it.)
With a block in hand, use the right mouse button to place the block. (You can use the scroll wheel to change the block you're holding.)
Accessing the Creative Menu
Click the 'E' key to open the creative menu; you can navigate the menus to look for blocks you want to use. Left click and add the block to your inventory to use it.
Now, at this point the completion of whatever project or game your child is creating might seem way off in the distance, it never hurts to talk about the last few steps.
Reason being, the one thing most creators want to do at this point is share and show it off with friends and family—and rightly so!
But, there's one last important thing to do before releasing everything to the internet and/or friends: testing.
When games are finished or during their development, video games are thoroughly tested to make sure all the parts work and fit together to make the final game the best it can be.