I recommend that you meet with a REALTOR member of the MLS with knowledge and experience in real estate investment, and make a buyer representation agreement with that agent if it looks as though investing is right for you.
If you have to ask this question on a website - then it's very possible you're not quite ready to invest. Financially speaking, depending on your current income and assets, there are NUMEROUS ways to invest in real estate. Having MONEY opens up doors big time, especially in this market. Cash is always king. Now with no money - you'll have to look for specific markets. Long Island is unfortunately, one of those areas where "no money down" deals do not really fly. Mid west, Northern states, and down south is more the area of focus. "Wholesaling" properties may even be something to look at, even on the island here.