Imperian has hundreds of help files to help you learn more about the game and how to play.
If you have the ability to fly, whether by virtue of a mount of some sort or magick then you will be able to fly from any outdoor location. The exits in the skies will be the same as the exits on the ground. From the skies, you can GLANCE GROUND and GLANCE TREES to see what's below you. Naturally, those who are following you when you fly will not be able to follow you into the skies. Furthermore, if you drop an item that cannot fly while in the skies, it will soon fall to the ground, and break if it is breakable. If you find yourself unwillingly dragged into the sky, and you do not have the ability to fly, you will have but a fleeting amount of time with which to make yourself levitate (through a feather tattoo or a levitation elixir, for instance) or you will be gravely damaged upon hitting the ground.