how can i create new region in theme?
First you need to define region in your_theme.info https://drupal.org/node/171205#regions

for example

regions[search_bar]         = Top Search bar


then you probably want to output that region in your page.tpl.php:

&lt;?php print render($page['search_bar']); ?&gt;


to make it height = 50 px and width=200 px you need to write some css. You can also add some wrapping div with id:

&lt;?php if ($page['search_bar']): ?&gt;
&lt;div id="search-bar"&gt;
    &lt;?php print render($page['search_bar']); ?&gt;
&lt;/div&gt;
&lt;?php endif; ?&gt;