Connect my webapp to the facebook api and write fql query using jquery

so far I am following the facebook doc to get started to connect webapp to facebook api. but i am lost somewhere.

"<script>"
$(document).ready(function() {
    $.ajaxSetup({
        cache: true
    });
    $.getScript('//connect.facebook.net/en_US/sdk.js', function() {
        FB.init({
            appId: '{app-id}',
            version: 'v2.5' // or v2.0, v2.1, v2.2, v2.3
        });
        $('#loginbutton,#feedbutton').removeAttr('disabled');
        FB.getLoginStatus(updateStatusCallback);
    });
});
"</script>"

where and how should i wright the fql query
what is the access token, does it changes over time for same page.
where should i give the access token to get the data from facebook.

Solution

<html>
<head>
<meta charset="utf-8"/>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js" ></script>
</head>
<body style="background-color:#cfeae3;">
<script>

window.fbAsyncInit = function() {
FB.init({
    appId      : '<your app id>',
    xfbml      : true,
    version    : 'v2.5'
});
};  
    (function(d, s, id){
var js, fjs = d.getElementsByTagName(s)[0];
if (d.getElementById(id)) {return;}
js = d.createElement(s); js.id = id;
js.src = "//connect.facebook.net/en_US/sdk.js";
fjs.parentNode.insertBefore(js, fjs);
}(document, 'script', 'facebook-jssdk'));
function getData(){
    FB.getLoginStatus(function(response) {
    if (response.status == 'connected') {
     city = $('#city').val();    FB.api("<query>",function(responses){

    }else if (response.status === 'not_authorized') {
    alert("not auth");
    document.getElementById('response').innerHTML = 'not logged in' ;
    } else {
    alert("not conne");
        document.getElementById('response').innerHTML = 'not connected';
    }
});
}

</script>
<div class="container">
<div id="tfheader"  align="center">
<input type="text" class="tftextinput" name="q"   id= "city"/>
<input id="btn"  class="tfbutton" type="submit"  onclick="getData()" />
</div>
</body>
</html>