How to advertise?

Good bye,

Imagine you have a company that specializes in logo design for companies and businesses.

How would you advertise? Where would you look for customers? Would you simply write to companies and ask them? And if so, where would you find their contact information? Where is the best place to find potential customers?

How would you go about getting as many customers as possible? Where and how would you advertise?

Thank you in advance for your answers.