Tommy, use the RootsSearch app. Go to the profile of the farthest out ancestor, click on the Family Tree tab, click on Genealogy Research, Click on "Research with RootsSearch"
If you haven't already, sign up for a familysearch.org account. Check your local library to see if you can access Ancestry.com for free. (even if you don't have an account to a specific site you can always post a specific question on G2G asking someone who does to look something up for you)
Then, when you use the RootsSearch app, you can find the sources that back up connections and start working on filling out your tree. Sometimes it's hard. Add a post on G2G with something about "brick wall" and people will jump in and help.
Use those Ancestry trees or Geni trees, or whatever you find online, as ideas for other research, but not sources with definitive information. Try to find all the census records, and make sure you add profiles for all the family members on those records, so you can more easily make connections.
You may be surprised, and only be one or two people away from connecting to the main tree, you never know!