Ed, as you have probably already figured out, there is a lot of competition here on Long Island. I am hoping that you are with an agency that mentors new agents, and can give you guidance in where to market. First time homebuyers are always good, but you shouldn't restrict yourself to just that. There are those who trade up, downsize, move out from the city after owning there, whatever.
You can do different kinds of things. Networking with those you know is always great. Let everyone know you are selling real estate. Go to as many local networking events that you can. Call expired listings and FSBO's to try to get listings. It doesn't happen overnight, but if you focus yourself on real estate, you will get somewhere. If you try to spread yourself thin, like by having another job, and doing real estate on the side, it doesn't work as well. Unless of course you have some kind of hook. There is someone who works for the same company that Anna does who is (or was anyway) a local music teacher in the high school, who always got tons of listings, and customers. People used to say that he used his teacher's salary, and I am sure you know how hight hat can be here on LI, to pay the taxes on what he earned from real estate.