Hi Zarko
Thats the million dollar question, if we could all do that I would be buying a lambo and filling it with cash : )
You have three primary sources of traffic Google, referral sites and direct requests.
Sadly these days their is no way to cheat google, SEO is a subject with much depth but the bottom line is it takes time, backlinks from relevent sources and good site with relevant content and keywords before you will see any decent traffic from Google, these days it takes time before Google will 'trust' your site and start moving you up the listings.
As @Luxin said social media is great for advertising, get on facebook, twitter and Google +. Google will see all this content and it will benefit your SEO.
Try to market your services to friends, family or people that you work with. Word of mouth is way more powerful that anything else. Building traffic is a marathon not a sprint.
Stay away from paid backlinks and other shady techniques, Google know all about the little tricks people use and will give your site a penalty if it finds anything it doesn't like.