For Poser everything should be inside the Runtime directory, Usually whatr you would need to include as follows:

Runtime:

     Geometries: (Any subfolder you placed the item in)

              myitem.obj    (this is the obj file of your item)

     Textures: (any subfolders under textures you placed your textures in)

             mytexture.jpg   (these would be all the textures used for your item)

     Libraries:

            Character:   (any subfolders under character you placed your character in)

                   mycharacter.cr2       This is for CR2's basically if its a character it goes in this directory

                   mycharacter.png     This is the thumbnail that shows up in poser/Daz

          Props: (any subfolders under prop you placed your prop in)

                   myprop.pp2             This is the prop file

                   myprop.png             This is the thumbnail

         Pose:  (any subfolders under pose you placed your pose in)

                    mypose.pz2      this is your pose file

                    mypose.png     this is the thumbnail

This is quick basic and hopefully understandable