Where and how to get customers T-T

I wanted to have a sideline to earn money but I don't know where to attract customers and how. I don't even know where to start since I'm new to this. Plus, I think it would be more challenging for me as a traditional artist because when I look at other's art and work that sells, they are mostly digital art so I'm kind of worried that I won't ever find people who are interested in charcoal/pencil rendering or charcoal portraits.