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Since a lot of people don't understand the basics of unwrapping and i see this question asked so many times i made a quick video showing the very basics of it. Theres a lot more tricks and techniques that are not covered in this vid. But once you start getting the hang of it they should come to you
In the end i also show how to set up the model for exporting to .smd and how a collision model is made, all very simple. And again, not everything to export is covered, just the very basics.
Here is a render of the model discussed in the video:
Here is a smaller version of the texture for you to use as practise (if you want):