There are SO many sites. Cruisin'Kroezes had the best idea for starting - asking relatives about ancestors. Be prepared for "I don't know", "Why do you want to know THAT?", and "Some things are better left alone".
In addition to the Internet, I'd suggest finding your local Family History Center (FHC). It will be at a LDS (Mormon) church and non-members (like me) are welcome. I was very apprehensive about my first visit but found out that prosletizing (preaching, trying to convert) is NOT allowed. Actually, I understand that 90% of the users at the FHC I use are non-LDS. Even a fair number of the volunteers there are also not LDS. You will be able to rent ($3.25 for about 5 weeks) films to use. These films are from churches, county/state records, census..... Anyway, I was able to trace one of DH's German lines back to the late 1500s from films of the original church records.
My favorites have already been mentioned, but I LOVE
Cyndi's List. I subscribe to
Ancestry.com and have found that not having to rent census films more than makes up for the cost. I also subscribe to Genealogy.com, but I'm not going to renew - it just isn't user-friendly (at least for me).
I've also had good luck with library web sites. At
PublicLibraries.com I've been able to locate the local libraries from where our ancestors lived. Some of them have VERY helpful. Don't forget your hometown library too. At our library's web site, I can log on to Heritage Quest (another subscription site) for FREE. They have many of the census indexed and viewable.
You'll also want some genealogy software. I have several, but my favorite is
Roots Magic.
Just be careful, there is a LOT of 'bad' genealogy out there. Just because someone puts a tree on-line doesn't make it true. Look for their sources and
PLEASE make note of your sources. I was told this when I first started and I didn't in the beginning. Trust me, you will
not remember where you found something hundreds of bits of information later.
Happy hunting!!!