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