I got to think about this article I wrote almost 10 years ago: https://www.sfimg.com/Training/SpecialReports/FreeAdvertising
Free advertising absolutely works, and you could use it to build up your business to the point where you can put some of the money you make back into the business. At that point you have learned a lot and don't waste it. When you have learned what is right in a small scale - you can upscale (I don't know how that sound in English, but in Swedish it sound OK :) )