Mapnik stylesheets for DXF/KML/SHP

Hi, I am using a local openstreetmap website (The Rails Port). I have successfully added DXF/KML/SHP files with JOSM and uploaded them to my local database. Everything is working except that my Mapnik tiles server is not drawing my exported data. It is only drawing specific items like buildings etc.

(for example, one of KML files contains many points/lines.. and they are not displayed by mapnik.) As far as I understand, I need specific stylesheets for Mapnik style/OSM Bright for my DXF/KML/SHP.

Should you need any additional information to better understand my problem, please let me know. Any help would be appreciated,