Press T and type /fly in mutiplayer. Note that this will only work if you are a mod and there is a flying mod installed.
In single player, double press space to fly. Press shift to descend and space to go higher.
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You can only turn off the rain if cheats are enabled. If they are, the command is /toggledownfall
To be in noclip in Minecraft, you will need to turn on your fly mode, and press the button that you set it on. Except some severs have some blocking thing that can block you from using fly mode.
First off you must be updated to the latest version of Minecraft Xbox Edition, then you go to your world and under Gamemode change it to creative, then you can double tap A to fly.
/gamemode a
turn off the firewall is all you can do.