To fly in survival mode you need to craft the eye of ender
Yes.
Yes.
NOPE
#$# $#$ #$# # = Gunpowder $ = Sand
Build the map on Creative Mode then go to seedscope.net and upload your level.dat for the map on the Change Survival to Creative option. You should then download the new level.dat. Replace it with the old level.dat and when you start Minecraft, you should see that it is now a survival map.
of course
Yes, in survival mode.
You dont, unless you have the single player commands mod. Which i suggest you download. That is, if you want to enter cheat codes in survival mode minecraft.
276 in survival mode. 322 in creative mode.
The strongest material in the survival mode of Minecraft seems to be obsidian. It cannot be blown up by TNT or creepers, and can only be harvested by a diamond pickaxe. Another opinion is that bedrock should be considered the strongest material as it cannot be mined at all in survival mode.
It's the default mode of minecraft, you need to collect your own resources and hunt animals to get food to feed yourself.