The great thing about using online or social media is that, for the most part, it is a forgiving venue. In the past, when you wanted to try to marketing something, even if it were yourself, you have to compose material, get it typeset, find a printer, and then get it distributed.
Today, marketers can test and experiment using online methods, and if something doesn’t work you can simply stop doing it, and try something else. Don’t be afraid to begin testing personally, which is what I have have done, and then used those learning on the job. An important element to remember to use is authenticity. Be yourself, and if you make a mistake, admit it. People appreciate humility and it can work to bond you to your audience.
Fear not, be bold, and do something. Doing nothing is the worst possible alternative.