To research your genealogy, begin by having a few facts. Names of modern ancestors will help you trace your family backwards.
If you are looking for someone specific, having an occupation for that person, the name of their spouse or child, or an approximate location of where they lived it will make it much easier to find them.
Talk to your relatives, find out as much information as you can. Sometimes family members will be able to provide clues they don’t even realize they are giving you.
Ask the locals. Someone might remember your family member or their children. They may have even gone to school with them.
Write it down! Write down everything whether you think it is important or not. It will help confirm the details later and it may be the missing clue you’re looking for.
The Society has an extensive genealogical collection including the publication Settlers of Putnam Valley, Their Ancestors and Their Children, compiled by Eric R. Peterson. This book, while still an invaluable resource, was compiled pre-internet and much of the information is now readily available on various genealogical websites including Ancestry. As it is nothing more than a complex listing of past residents of Putnam Valley, we now mainly utilize it as a quick starting point for research.
Putnam Valley Historical Society 
I am a direct descendant of Andrew Barger. Thru John to Nathaiel to Nathaniel C. Etc My husband and i were down there on oct. 14th visiting the adams corner cemetery and the Tompkins corner cemetery. Found many of my relatives. After being there i find myself wanting more information about where they lived. Where did a lot of the headstones go etc. Also how Sarah and Henry children of Cornelius and Phebe died. They were children that died on the same day mar 27th 1864. Would love an apt with someone to hear about ant information i can get.