... Oh dear.
1) You're in the modelling forum. This is for modelling. Texturing is not modelling, last I checked.
2) You might wanna attach a .JPG version of the unwrapped skin, just so that someone can even see whether it is even worth the trouble (since it's your first, I doubt it).
3) I can't imagine how the skin is if you don't even know how to import it back into the game.
4) There is a tutorials section, and a 'Search' button for a reason. Use both of them. If you did, this thread would be completely unnecessary
5) Suppose you were incapable of importing the skin yourself (for whatever reason) and needed someone to go through with this absurd plan of yours, you can attach files to a post, so that other users can download them right from your thread, rather than having to email or PM the file.
Now then, i'm sure this will be moved somewhere else soon enough, follow my instructions and you should be on your way. Keep in mind that if you make another thread like this you will be punished.