There really is no need to craft in Minecraft PE Creative Mode. You have an infinite amount of every single item and block in the game in your inventory already exept 4 command blocks
You can't currently get flint in Minecraft PE.
Yes it does.
You would have to make a Creative Mode world...
you cant at least not yet as at the moment you cant craft in the pocket addition.
In Minecraft PE 0.7.1, you can create spawners using commands or by accessing creative mode. However, the game does not natively allow players to craft or place spawners in survival mode. If you’re in creative mode, simply select the desired spawner item from your inventory and place it in your world. For custom spawners, you may need to use third-party mods or tools, as the game’s version is limited in features compared to later updates.
There's no way to get flint on Minecraft PE if yo are on creative mode. However, you can build a craft table on survival mode and craft flint and steel out of one iron ingot and one piece of charcoal.
In PE you can't craft anything.
Currently, you cannot change day to night but it is thought to come in a few updates.
There is no app you download to change your current gamemode in a world in Minecraft: Pocket Edition. Once you select a gamemode for a world, that is your permanent mode, you can't change it around.
make a bucket out of wooden planks.
No, nor can you in survival. The Nether Reactor of Minecraft PE is not the same as the Nether in the PC or Xbox versions. Nether reactors only work in survival (intentional)