I started out with a regular Pinterest account, creating a board for my shop, but also creating boards with pins of items I loved-color schemes, home decor, fashion, etc. that reflect who I am and the type of customer I would want to attract. It's also important to follow other people's boards and build up a following. Then I created a Pinterest business account. Pinterest has a lot of information there on how to promote your business. You learn how to create ads, etc. It takes time, but learn all you can. Pinterest is more my style, because I'm visual and don't have the opportunity to sell in person due to where I'm located.
Every one is different as to how they want to promote themselves. More social people would do well with Instagram and Facebook. The key is consistency. Have in mind the type of customer you want, then focus on attracting that type. (age, income, personality,etc.) You have to know who your customer type is before you can be successful at promotion.
