Good luck on starting your business. There is an assumption embedded in your question. That your customers will be local. That may or may not be true. There are a number of sites where you can compete for business globally like 99Designs, DesignCrowd, Upwork to name a few. The benefits of being on these sites is that you will be competing for work from people actually in the market for design services.
Here is my question for you. Why do you think graphic design services is something that potential clients want to buy locally?
Good luck, Marc