Not an easy question to answer as I'm sure everyone will appreciate but my thinking is off the top off my head as it comes to me
1. Decide what you want to achieve (sell lots or get known as a brand first)
2. Find out what your competitors are doing successfully to get customers ( this is likely to be making an excellent product but could also be because they have a range or something consumable and can thus attract repeat custom)
3.Decide whether you are using social media, which types and in which way ( some people focus on Facebook to showcase, some Pinterest, some use Twitter) but the main thing is to maintain a sustainable flow of communication and interest to your followers, you prob need to experiment to see what works for you
4. You don't have to go it alone, join groups and teams, there are several who will promote you and your things for you
5. Start by trying something, access if it's working, if it isn't find ways to expand on or change the ideas and keep going.
6.Believe in yourself and your product but build a good foundation for success to grow, accept that it can take time and perseverance, don't give up, because you might miss success that was coming ( having said that do be realistic about who you are and where you are with everything to do with your business so you can learn what needs to be learnt along the way, without thinking you are failing).
Hope that helps in some way Lampara, sorry I took a few days to respond, I saw that I had a message but could not work out what it was, but luckily just saw it now, I know I am not saying where it would be best because there's no right answer, there are lots if social media platforms, the obvious ones having been mentioned.