Good. I am glad to hear you are making some progress!
you have to specify the bibliography style for latex export somewhere in the document. You can use a bibliographystyle link for bibtex, eg. bibliographystyle:unsrt. That will get exported to \bibliographystyle{unsrt}. That link does not do anything but export to latex. or you can simply put \bibliographystyle{unsrt} above the bibliography link. For any other thing like biblatex, just put the code that specifies the style where it belongs, e.g. in the header with #+latex_header: or at the end with the raw latex commands. Not all documents require a style, article classes do, but the revtex4-1 class, for example defines the style for you.
I wonder if you are adding another cite link later that overrides my cite link. do the other citation links export ok, e.g. autocite, citeyear, etc...?