@Bursahibinden
First, I do not like when someone leave feedback on product before asking some question. That is very poor.

1) Car attributes if free plugin not delivered with theme, you can see on demo how theme handles it, but it does not mean we are responsible for plugin. Contact it's author
2) By default new listing is not premium, this is osclass setup. By default, theme shows on homepage only premium listings, however this can be disabled in theme configuration in oc-admin
3) Google maps plugin is free plugin, on demo you can see how does it look, but again as in 1), we are not responsible for it's functionality. Use official version from osclass market or contact it's author

To other comments I did not understand, please do not use google translator.