Most effective marketing method is to make your costumers talk about your service and spread it to their friends and acquaintances… You get that by overdelivering a content and staying at their service longer than you would usually for $5! Being nice and writing longer messages (no matter how much buyers you have) will certainly cover your losses on other fields! Facebook ads to targeted extracted groups of people will help you get more exposed! If you find targeted people, and you include call to action to your ad, people will like, comment and, share your post with gig link in it (10 - 15 times cheaper than to just advertise standard ad!) Great Time Management! Hope it helps along with other tips here (: