I am trying to make self contained object-assets for someone. I have the textures and fbx format geometry, but really have no idea how to export the textures and models together into a unity prefab so that he is just able to import an object. Any help would be appreciated.
Just select your prefab in your project panel, right-click and choose export package. It will automatically include all dependencies. You can select as much assets you like to pack together in a package.
If you open a .unitypackage it will show an import dialog where you can select the assets you want to import.
Select everything you want to export with ctrl-clicking in the project tab, then right-click and choose export package - everything you selected will be included in the package.