xsl:fo rendering

Hello people,
I am a newbie to xsl:fo.. and no wonder it is full of confusion to me.
I started off with an example ..
the following is the code..

<?xml version="1.0" encoding="UTF-8"?>
<fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format">
<fo:layout-master-set>
	<fo:simple-page-master page-master-name="my-page">
		<fo:region-body  margin="1in"></fo:region-body>
	</fo:simple-page-master>
</fo:layout-master-set>
<fo:page-sequence >
<fo:flow flow-name="xsl-region-body">
		<fo:block> Hello World</fo:block>
	</fo:flow>
</fo:page-sequence>
</fo:root>

This would print Hello world in the PDF Format.
I beleive the following about xsl:fo..
XML + XSL --> XSL:FO--(xsl:fo processor)-->Final Output.

My questions are as follows:
1.How do we write the XSL to produce the above XSL:FO file? I am quite ok with 
writing xsl style sheets but do not know how to write xsl to produce xsl:fo..
Please assume that i know nothing about xsl:fo.

I am very much interested to learn this subject.I hope i would be  able to do 
good in xsl:fo with your help 
Thank you very much. 
Subbu

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