Just make it look like you are serious about being in business for yourself. Never call yourself a freelancer. That implies you are writing as a hobby. If you are getting jobs through a consulting firm or job shop, where you become a temporary employee of the firm, say you are subcontracting. The attitude of being in business for yourself is essential.
Marketing is important Marketing is a most important part of being a business.
It should not be thought of as some chore to perform. Continue to do marketing, even with clients you worked for before. Send out your brochure, a newsletter, or give them a call every so often. Don't take clients for granted. Above all, ask clients for referrals.