The most controllable medium is probably PPC (e.g. Google AdWords, FindWhat, Enhance.com, SearchFeed.com, Overture.com). Open up a Google account and you can mess with campaigns til you find out what works for you.
ill repeat a money mantra: to make money you have to spend money.
How long will you go after cheap and free stuff? the clients you get from them will disapper just as quick when they find someone else. target your market. if you dont have a budget for advertising do lots of social networking and begin locally & expand