Digital marketing is absolutely crucial.  I may be biased since I own a digital marketing company, but what better way to start a business and reach your customers than be online?

A previous comment hit the nail on the head.  Create a website, optimize it for SEO, create a GMB listing (if you have a physical location), create a business Facebook, LinkedIn, IG page, start creating business listings on Angie's, Yelp, BBB, etc.

Digital marketing doesn't have to be just paid advertising.  You can get a lot of exposure for little to no cost.

Hope this helps!