If any of those are what went wrong, how do I tell and how do I fix them?
Add a light to the scene and go into texture mode. If there are any "holes" in your model, go into edit mode and face select mode. Select the faces and hit ctrl f- flip normals. For the UV tex, hit F9 (editing window) and where it says
texmesh:
sticky
UV texture
vertex color.
If it has a UV texture, under where it says UV texture, there will be something saying UVtex. Delete that.
To fix lighting, go into object mode and add a cube. Select one part of your model and then select the cube. Hit ctrl j and join the one part to the cube. Go into edit mode and delete the cube. Then go back to object mode, add a new cube, and repeat with a different part of your model.