mettichi on "New Theme"

Dear Friends,

i have converted a html theme to a wordpress theme but now i have encountered many problem, iam trying to add a portfolio plugin to my wordpress site, i have tested more the 5 plugins, i install the plugin configure it and when i create a new file and put shortcode in the page and preview the page i don't get any result, so i have create a template page, i just add these instructions.
<?php get_header(); ?>
<?php echo do_shortcode('[otw_portfolio otw_filterable]'); ?>
<?php get_footer(); ?>

but the result was very bad, in the page i see all pictures one after other

i have also created a template page and put into it just these instructions:

<?php
/*
Template Name: Default Page
*/

<?php echo do_shortcode('[otw_portfolio otw_filterable]'); ?>

but i got the same result bad representation of the portfolio i have done the same configuration of the plugin in other theme and it works fine

i have also a problem to get posts i use this loop script:

<?php while (have_posts()) : the_post(); ?>
<h1><?php the_title(); ?></h1>
<?php the_content(); ?>

<?php endwhile; // end of the loop. ?>

but i didn't get any post in the page, i have created 5 posts but i didn't get any result
any help from your side please i appreciate it.

Thanks in advance