Buy keywords on Google for your home's website;
Every piece of marketing material should include the website;
Put it on your local MLS....this will cost you a few hundred dollars;
Find a local printer and design a brochure to put in a box on the sign in front of your home;
Make sure your home appears on all of the major websites....only a Realtor can put your home on Trulia by the way...one of the top 5 websites;
Include a phone numbers for buyers to call....and they will....24 hours a day;
Be sure to schedule open houses;
Find out when your local marketing meeting is and let Realtors know your home is for sale (90% of buyers find their home thru a Realtor);
Schedule a pest inspection and be prepared to take care of section 1 work;
Schedule a home inspection;
Fill out all disclosures(what's a disclosure...maybe a local Realtor will help you with these FREE):
Upload inspections and disclosures on the MLS;
Be prepared to pay a buyers agent if they bring a buyer...a likely scenario;
If you are not represented and you ask me to handle paperwork for both sides, I will ask for commission on both sides of the transaction....
and the list goes on.
Keep one thing in mind. Buyers that are looking at FSBO's typically will automatically reduce your asking price by 6-7% since they will assume that is what your saving on not paying a Realtor.
If your pressed for time to sell, than you might want to contact local Real Estate firms and let them know that you would at least be willing to cover the buyer's agent side of the commission. This alone could generate a buyer very VERY quickly and still save you the listing side of the commission.
Congratulations on attempting to sell your brownstone yourself. There are a large number of questions regarding FSBO's (For Sale By Owner) on Trulia's Talk threads. I suggest reading them if you're looking for pointers. My second suggestion: Get a good real estate attorney so you can be informed about all the disclosures you're responsible for and other legal consequences involved in selling your brownstone.
If it turns out that you decide to hire a Realtor in selling your brownstone, please think of me. I would like to interview for the position. If you need a referral for a great real estate attorney, shoot me an email. I would be happy to provide that also.