when you are changing to have wings, you may want to think about the type of wings you want. Specifically you want to think about whether or not you want feathered wings, or leather wings. Feathered wings are essentially the wings you will find on an eagle, while leather wings are like those of a bat. In my experience (though i may be wrong feel free to correct me) leather wings tend to be a lot heavier and require more strength to use, but due to the weight there is more force behind each flap so you can gain a high velocity through momentum once you get going, but stopping can be harder
while feather wings are a lot lighter, take more effort to get to high speeds and are a lot more agile, although they are a lot more fragile then leather wings.
just something to think about.