In the create new world menu, just scroll down until you find the "world type" area. Then click on where it says "infinite" and select "flat" from the drop down list. Finish customizing your world and then click "create" to create the world.
You can absolutely be subtle about your feelings in your letter, but know that your crush might not understand. It's better to be clear about your feelings, so everyone is...
They are referencing pulling the actual joint. If you wish to tune using the rolling method (which I do not condone, since better tone comes from having the flute rolled...
You cannot enable subtitles on any Bedrock edition of Minecraft, including Xbox editions of the game. It is a feature exclusive to Java/PC editions of the game.