There are several very good web pages that provide lots of information on how to care for family collections.
The Northeast Document Conservation Center has this page.
The National Archives has a similar, very useful page.
And finally, the Library of Congress has some very comprehensive general information about preservation. The in-depth information can be found here.
If you are looking for supplies to protect and store your family archives, we routinely buy our supplies from either Gaylord.com, or HollingerMetalEdge.com.