[Toxaris]

You have to do this in the code. A forced page break is a bit of hit and miss with readers. You might want to try a 'page-break-before: always', but there is no guarantee it will work. However, a new file will always start on a new page. So, split the files at the correct place if you want to start on a new page.
With regards to indent (please, don't call it tab...), do the following in your stylesheet:

p {text-indent: 0;}
p.initial {text-indent: 1em;}

and then in your xhtml file:

<p class="initial">Text of the first paragraph. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed lectus lorem, pulvinar malesuada fermentum sit amet, tempus a ante. Aliquam tincidunt neque eu risus luctus, id tempus velit facilisis. Etiam ullamcorper convallis lectus, non pulvinar felis ullamcorper nec. Ut nulla erat, condimentum ac molestie id, rhoncus at nisi.</p>
<p>Second paragraph. Nulla faucibus diam et condimentum porttitor. Donec pretium arcu eu sem posuere, quis fringilla nunc interdum. Phasellus facilisis id justo ac vestibulum. Sed eget lectus lobortis, placerat justo a, molestie orci. Nulla facilisi. Pellentesque auctor hendrerit elit ut laoreet.</p>
<p>Third paragraph. Aenean et diam aliquet, malesuada mi ut, porttitor arcu. Ut tempus sapien pellentesque enim commodo, sodales pretium purus luctus. Cras maximus sapien vitae ultrices pellentesque</p>

There are more ways, but this is the easiest I guess.