Step 1) Verify Brand Name & Get Form
While Maryland's not a big state, it's still prudent to conduct a Business Entity Search through the Dept. of Assessments & Taxation (a critical resource) to ensure the name you want to file/register isn't already taken or too similar to another. For any potential trademark issues, use the TESS System through the U.S. Patent Office.
Once you've squared away the name, you'll need to get a Maryland Trade Name Application.
Now would be the perfect time to make sure there’s a web domain available for your DBA.
Step 2) Correctly Fill Out Form
As you can see the form is pretty comprehensive with instructions, fee information and so forth. Before filling in anything make sure to read (and understand) every word. This is especially the case if you don't have legal representation and aren't working with a DBA registration service.
Don't wing this. If you're unsure about anything then utilize the countless resources at your disposal. If for no other reason than saving yourself the filing fee.
Step 3) Notarize & Submit
Once you've double and triple checked, get the document notarized by an authorized individual. Filing in Maryland can be done in person at the designated agency, through mail or by fax.
A filing fee of $25 for regular processing or an additional $50 for expedited processing should be enclosed and addressed to the Department of Assessments and Taxation. There's a $75 "Total Expedited Service" as well. Once you get confirmation, you'll officially be the owner of a Maryland DBA.