Ok. So, you spawn on this barren land surrounded by these green ****s. There are no ores, just bedrock. But there is hope, and it might be quite obvious to some.
Finding wood, getting coal:
On these barren plains are NPC villages. They still spawn in Superflat. To get wood, just steal some off the farm or house trims. Then, when you get enough stone (make a wooden pick) then mine a lot of cobblestone. Then craft a Furnace, and burn logs into Charcoal.
Getting some food:
It's quite easy. Just harvest some wheat from the NPC farms, or find them in chest.
Finding some stuff:
In every NPC village, there might be a chest. Chest are in Blacksmiths. Inside a chest (this is all I know) is:
Getting these can bring you to the Nether. You can get lots of materials to settle in the Overworld safely. Make a nice netherack base (or netherack brick, whatever you want) and make a tree farm and flourish. Getting water is from wells in NPC villages. This might not be the best guide, but I made it. Hope you enjoyed!
Looking for challenges? Some are listed on page 2!