Query regarding using custom Stylesheet and CSS through java command

Hi All,
I came to know regarding DITA Open Toolkit and i very much impressed what it does. So, i installed and everything is working fine. But, what i need now is to change its look and feel like xsl, css, main or cover page.
If possible than let me know how i can make my own XSL, CSS or change main page in which "cover art/text goes here" resides. I want to place my image on main page and also want to change header and footer while converting or transforming it into PDF from ditamap file.
All this i want to do using java command and setting arguments like /css:{arg.css}, /xsl:{arg.xsl}, etc. which is required.
Thanks in advance.
Waiting for ur cooperative reply.
Hiral Desai

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