When you go to create your world you hit play. It will bring you to a screen with a paper and pencil thing at the top. You click on that. Than what pops up is Where you name your world. Than you say if you want old flat or infinite. Than hit create world. I almost forgot before that you click survival or creative. I recommend start off with
Creative than survival so that way you can build your house and everything than switch to survival.
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Minecraft ( what to expect)
Non-FictionEverything I know about minecraft pocket edition