Build your family tree on line.
You can use a paid site like:
http://www.ancestry.com/
OR You can do this for free on:
http://www.tribalpages.com/
Start with yourself, and then attach living family members.
Find out all you can about you family from living members, then attach it to your tree.
Now it is time to look for historical records and attach the info to your tree:
It is ALL about census records, and other historical records!
You might get lucky and others may have done some work on your family tree. Google family members names i.e. "Mary Smith" + "family tree"
Free sites:
http://www.searchforancestors.com/
http://www.censusrecords.net/?o_xid=27399&o_lid=27399
http://www.usgenweb.com/
http://www.census.gov/
http://www.rootsweb.com/
http://www.ukgenweb.com/
http://www.archives.gov/
http://www.familysearch.org/
http://www.accessgenealogy.com/
http://www.cyndislist.com/
http://www.findagrave.com/
Genealogy message board:
http://www.bbc.co.uk/messageboards/newguide/?board=history
http://forums.about.com/n/pfx/forum.aspx?webtag=ab-genealogy&nav=messages&lgnF=y&msg=90.1
http://boards.ancestry.com/
http://www.gensource.com/common/search.cfm
http://messages.yahoo.com/yahoo/Family___Home/Genealogy/
http://genforum.genealogy.com/
http://www.genealogyforum.com/messages/
http://www.progenealogists.com/messageboards.htm
http://messageboards.aol.com/aol/en_us/boards.php?boardId=56406&func=2&channel=aol+research+and+learn&refresh=true
http://boards.rootsweb.com/
ECT.
The time may come when you want more information than you can find for free. When this happens you can back up your "tribalpage" tree to your computer on a "GEDCOM" file
you can then go to (I think it is the best subscription site)
http://www.ancestry.com/
Upload your "GEDCOM" file
and start to work!
You might need to make a few adjustments to your tree to make it look better.