You have to find a village, I would suggest that when you find a village to put it on Peaceful Mode because if you don't, you might end up with a empty village or a village of Zombies. First you should make a wall, 4 blocks high and then on the top block of the wall put a single slab on the top block but place it on the lower bit of it. Then put heaps of torches in the village.
Other ways to find villages is to search for a seed on the internet that makes you spawn right next to or near to one.
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To fly in survival mode you need to craft the eye of ender
In creative there is a spawn egg for spawning a villager, but in survival you have to find a village, there its a lot of villagers walking around:)!
#$# $#$ #$# # = Gunpowder $ = Sand
It's the default mode of minecraft, you need to collect your own resources and hunt animals to get food to feed yourself.
yes, in the demo