How to sort a code execution in node.js Non-Blocking code?

I have build a web-crawler using node.js, but one of the main features of node.js, is Non-Blocking code, which is great, but in my case it is breaking my program. Here is how my program used to work:

1. First it makes the request for the website and finds all links to all companies that passed on the page;
2. Then I have the for loop that modifies that companies URLs array;
3. Then I have the request that is in the for loop that goes throw the array of companies URLs to find all products URLs in each company page;
4. Then I have the for loop that modifies that products URLs array;
5. Then I have the another request that is in the for loop that goes throw the array of products and gets the price of each product and store it into dictionary(object) where the key is the name of the product and the value is the price;
6. And last, I modify my dictionary(object).

As you can see each of my steps depends on a step before it. So I need to do something so my program runs in the order I listed. I have tried to use callback's but it did not end pretty well. Because here is a simple example of a callback:

function some_function(arg1, arg2, callback) {
    var my_number = (arg1 - arg2) * arg2;
    callback(my_number);
}

some_function(20, 15, function(num) {
    console.log("callback called! " + num);
});

But I do not imagine how to make callback that would have 6 functions. Maybe there is a way, but not with my knowledge of callback's. Here is a demo version of my program without callback's:

var request = require('request');
var cheerio = require('cheerio');
var companiesUrls = [];
var url = '';
var companiesUrls2 = [];
var carsUrls = [];
var carsOwnerReview = {};
var carReviewUrl = [];
var site = '...'
var companiesPath = '/companies'
///step 1\\\
request(site+companiesPath, function(err, resp, body){
    if(!err && resp.statusCode == 200){
        var $ = cheerio.load(body);
        $('a', '#group-content').each(function(){
            var url = $(this).attr('href');
            companiesUrls.push(url);
        });
    };
});
///step 2\\\
for(var i=0;i<companiesUrls.length;i+=2){
    companiesUrls2.push(companiesUrls[i]);
};

///step 3\\\
for(var i=0;i<companiesUrls2.length;i++){
    request(site+companiesUrls2[i], function(err, resp, body){
        if(!err && resp.statusCode == 200){
            var $ = cheerio.load(body);
            $('h3.edition-title').children().children().each(function(){
                var url = $(this).attr('href');
                carsUrls.push(url);
            });
        };
    });
};
///step 4\\\
for(var i=0;i<carsUrls.length;i++){
    carReviewUrl.push(carsUrls[carsUrls.length-1].slice(0,-7)+'/owner-reviews');
};
///step 5\\\
for(var i=0;i<carReviewUrl.length;i++){
    request(site+carReviewUrl[i], function(err, resp, body){
        if(!err && resp.statusCode == 200){
            var $ = cheerio.load(body);
            var model = $('#page-title').text();
            $('span.total-votes').children().each(function(){
                var reviewNum = $(this).text();
                carsOwnerReview[model] = reviewNum;
            });
        };
    });
}
///step 6\\\
var keysSorted = Object.keys(carsOwnerReview).sort(function(a,b){return carsOwnerReview[a]-carsOwnerReview[b]});
var keysSortedReversed = keysSorted.reverse();

So my question is: What should I do to run my code with node.js in my order?