Its is very easy to make your website responsive with bootstrap just include bootstrap library. You can download it from here and you can also include on-line library of bootstrap
<!-- Latest compiled and minified CSS -->
<link rel="stylesheet" href="//netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css">
<!-- Optional theme -->
<link rel="stylesheet" href="//netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap-theme.min.css">
<!-- Latest compiled and minified JavaScript -->
<script src="//netdna.bootstrapcdn.com/bootstrap/3.1.1/js/bootstrap.min.js"></script>
and just include class to <div>
it will make your site responsive. and you can find more help from here and if you can submit some code I will help you more feather.