You can create an LLC to use any name you want, so long as that name is not currently being used for a business in your state. You don't need to separately register a DBA; you simply register the chosen name when setting up the LLC. A freelance writer/editor/etc. does not have to work under his/her own name but can select any name he/she wants for the LLC; for example, I have single-member (me) LLC for legal writing and editing I do, and it uses the name "Four Chairs Communications."