You don't really want atlas mapping(well you might). You want the model to be as island free as possible...in blender enter edit mode(tab)>change your selections to edges(ctrl+tab),edges>select the edges you want to use for a seam(like slicing)>mark seam(ctrl+e)mark seam>select all(a key)>then unwrap(u),unwrap.
You will need a minimum of two views for this one 3d view and one uv image edit view. If you are unfamiliar with what I am talking about, check out my free video "meshing around in blender". It is located on my tutorials page. It should give you a basic understanding of blender(very basic).