You need to go to
www.familysearch.com I went there and put the name Calvin Warren, for life event I selected Birth/Christening, for year I used 1841, for year range I selected +/- 5 years (to cover the years you mentioned), then I selected United States for country and left it set for all states.
Scroll through the results. I found several hits with Rebecca as the mother, they also listed David Warren as the father. Several show 27 FEB 1841 as Calvin's birthdate in Rockcastle, KY. Some of them show the lines continuing back on the various lines. They also show 2 marriages for Calvin.
It looks like there is quite a bit of info to get you started.
Good luck and have fun. I wish a couple of my lines were this easy.
Doug