You can google "We Buy Houses in LI," call bandit signs if you see them, go on Craigslist and seek out ads who are looking for properties, or even post an ad stating you'd like to work with investors to bring them deals and locate investors that way. 

Two thoughts- You can "drive" down every street using google street view.

(I had a dream that if its illegal in an area put them out Friday afternoon, pick them up sunday night, put a google voice number on them.)But, I have gotten my most profitable deal from direct mail.Still new, trying to figure out the best way ):

I normally look up the properties through Google Maps.

Abdul - If you're looking for turnkey properties and Central PA is not too far away I would recommend PA Deals (google them).  

Google a few contractors, ask how they do their contracts and get some prices.

Google Jerel Ehlert, he is good!

Google.  

To figure out how much it would rent, try googling "(the zip code) rental home" or something to that effect.  

Well... having never made an offer on a house before, I went to google to help me out and find out what I needed to do.