Saturday Searching

I am working on tracing my Father's family tree. At this point all of my searching has been online, mainly through Ancestry.com and FamilySearch.org. Some information I have verified with my Mother as she had met some of his Uncles and cousins when they were first married. My Dad died when I was 6, so I can't go the route of questioning him, and his Mother died when I was 18. A long time before I was interested in knowing my family history.

I know that I am going to need to make some actual physical trips to county courthouses and Family History Centers to get information but want to make the best use of my time and resources. So that I get quality information and documentation. I haven't figured out how the numbering of family lines works yet, so please forgive me if there are errors in how this is done. I still have a lot to learn about genealogy. Any help that anyone can give me would be greatly appreciated. Where to go? What to look for? Where to look?

My current information:

1) Charles Aaron Mathews
b. 14 Feb, 1926  Concord, Pike, Georgia, USA
m. 23 Apr, 1966  Beaufort, SC, USA - Edith Jean Cole
d. 16 June, 1974 Augusta, Richmond, GA, USA

3) Roger Thomas Mathews
b. 5 Oct, 1901 Concord, Pike, GA, USA
m. 18 Dec, 1921 Pike County, GA - Willie Roberta Milner
d. 12 Nov, 1948 Augusta, Richmond, GA, USA
4) Willie Roberta Milner
b. 4 Apr, 1906 Militia District, Coffee County, GA, USA
m. 18 Dec, 1921
d. 10 Aug, 1987 Augusta, Richmond, GA, USA

7) Uel Aaron Mathews
 b. 23, Dec 1877 Pike County, GA, USA
 m. 21 Nov, 1900 Pike County, GA- Lydia Elizabeth Harris
 d. 7 Nov, 1939 Concord, Pike, GA, USA
 8) Lydia Elizabeth Harris
  b. 1 Nov, 1881 Concord, Pike, GA, USA
  m. 21 Nov, 1900
  d. 12 Aug, 1938 Concord, Pike, GA, USA
           
9) John Willis Milner
  b. about 1867
  m. in 1897 Pike County, GA, USA
  d. in 1961
10) Elizabeth ?
  b. about 1881
  m. in 1897 Pike County, GA, USA
   d. ?

11) Edmond Dyer Mathews
b. 9 Oct 1851 Pike County, GA, USA
m. 23 Dec, 1875 Pike County, GA - Sarah Thomas Oxford
d. 1936 Concord, Pike, GA, USA
12) Sarah Thomas Oxford
b. 17 Jan, 1847 Henry County, GA, USA
m. 23 Dec, 1875
d. 4 Aug, 1907 Pike County, GA, USA

13) Jonathan James Milner
b. 10 Jan, 1831 Wilkes County, GA, USA
m. 2 Jan, 1853 - Nancy Catherine Bouland
d. 3 Jun, 1910
14) Nancy C Bouland
b. 14 Mar, 1834 Zebulon, Pike, GA, USA
m. 2 Jan, 1853
d. 16, Dec, 1918 Concord, Pike, GA, USA

My #'s 9 & 10 are my brick wall right now. I do have census records during the appropriate times, but no where can I find Elizabeth's maiden name or specifics on birth, marriage, and death.