I have not seen your model. Does it require a normal map? Normal maps are used to give the illusion of depth similar to bump maps. They are typically used in a modeling workflow moving from a super hi poly sculpt mesh to a low poly modeling mesh + normal maps.
The site has a number of excellent tutorials on laying out uv's. It's not always necessary to UV every single piece as basic materials and procedural shader networks can be used in many cases unless you intend to paint every part by hand.
If your model does not require normal mapping then the workflow would be as follows -
Build the mesh, assign materials, uv layout, texture paint.
"If I have seen further it is by standing on the shoulders of giants." Sir Isaac Newton, 1675
Last edited by ctbram; 01-02-2011 at 04:43 PM.