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List of problem : Create 3d Model's UV Atlas

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I use triangle list to implement my 3d model datastructure.
    D3DXVECTOR3 position; 
    D3DXVECTOR3 normal;   

struct 3DMODEL{
    UINT numTriangle;
    CUSTOMVERTEX* vertexlist;
}; do I transfer my model to ID3DXMesh ? do I generate a texture atlas by using D3DXUVAtlasPartition ,D3DXUVAtlasPack and D3DXUVAtlasCreate these three function?If my texture is a bitmap. 3.In the description of function D3DXUVAtlasPartition.The parameter "pFacePartitioning [out] A pointer to an array of the final face-partioning data. Each element contains one DWORD per face " what's that mean?Does it mean that a face data of three vertex triangle compressed in a DWORD?

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