"UV mapping is a 3D modeling process of making a 2D image representing a 3D model. The map transforms the 3D object onto an image known as a texture. In contrast to "X", "Y" and "Z", which are the coordinates for the original 3D object in the modeling space, "U" and "V" are the coordinates of the transformed object. This creates the effect of painting the image onto the surface of the 3D object."
You just need to understand that is the way to unfold the polygon into a 2d dimension. To make this first of all you need to have the model completely done. I mean you can add edges and some vertex, but not too much cause it could affect the uv. Add a planar mapping with a checker texture, it will look something like this:
After this is done, you will divide the model in parts: head, body, legs, armas, hands and so on. This is done by selecting the complete division edge (remember that all the model needs to have logic in the direction as well to be continuous) and then cut uv edges.
This part will be separeted from the body by selecting a uv for the area, and then in the uv editor right click / select/ select shell. The whole shell will be selected and you will be able to move it to leave space to cut the other parts. After all the model is cut now you will unfold.
For example the head, select the edge that divides in the middle the head and cut it again. Separate it, and now is time to unfold. But remember something, diselect one uv from the top and the bottom, this means this won't move and will stay in the same position. After you have unfold both, try to put them close to each other, select the edges of the middle and sew them. Buala!
NOTE: Not all the time this will be the best, you will need to play with the sew and unfold to have the best results.
Here is a pic of what I am talking about:
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