Yes Family Search is a free site maintained by the LDS church (Mormon). Sometimes Family Search has records that Ancestry.com does not have. Family Search is an excellent place to start in most cases when hunting for ancestry information.
When searching Family Search, don't forget to check the bottom of the page of "hits" for Family Trees.
Ancestry.com is the best overall site, bar none. It has tons of stuff Family Serach does not have, at least for Americans (it has some international records too of course). You are fortunate to have a subscription. When that runs out, try your local library - many libraries have an Ancestry subscription.
Using a library subscription for Ancestry is limited. For example you can't contact other Ancestry members who have submitted family trees. So make your contacts now (if there are others researching your lines), while you have a subscription.
When using Ancestry be sure to search in individual databases. For example, searching in a military database might turn up a draft card or other record that didn't show up in a general search.
Download the images of the original census (or other record) as well as making a transcription of each relevant record. I label mine with the year and then with the name of the head of household. That way you can see that a given census year is missing for a given individual, and you can go back to search for it, which is often helpful, as in the case of the critical 1850 census for Samuel M. Stouffer.
Consider making a Facebook page for your Stouffer family history - you may attract others in the extended family who may be able to share photos and other stuff not found on the internet.
Well, that's an answer to some questions you didn't ask! hehe