Before launching a digital marketing agency, it's critical to understand the company's goals and business processes. Your business plan, for example, should clearly define your target audience and the services you provide. It is beneficial to define your team's skills and collaborate with others when defining the scope of your business.

To begin, you should have an office, which can be a spare room in your home. For the best results, you'll need a strong internet connection. It is also critical to establish a website. Because this is your agency's first point of contact with the outside world, it must be professional and reflect your brand identity.
You'll also need to invest in learning. You can read blogs related to seo services or watch YouTube videos on digital marketing. But if you're serious about becoming a successful digital marketing agency, it's best to invest in a formal study. I highly recommend The Marketing Agency Blueprint by Spencer Gallagher and Agencynomics by Peter Hoole.