Trying to locate the parents of this John Fields my GGGGGrandfather ...HELP I"M AT A DEAD END!

John Fields Sr born 3 Dec 1763, Rhode Island died 29 Dec 1853, Henry County, TN married about 1808 Greene County, NC to Martha Speight Born: 7 Nov 1777 Greene County, NC, died 6 Sep 1867, Henry County, TN

Children (some of whom MAY have been born in RI with an unknown prior wife)

Nancy Fields b: 10 Nov 1794
Bennett Fields b: 1797 d: 1883 Greene Co., NC
John Fields, Jr. b: 09 Feb 1801 d: 13 May 1886 Weakley Co., TN
Freelove Fields b: 17 Jun 1803 d: 10 Oct 1855 Henry Co., TN
Frances Fields b: 18 Mar 1809 Greene Co., NC d: 29 Oct 1871 Henry Co., TN
Axie Fields b: 1815 Greene Co., NC d: ?
Alexandria Fields b: abt. 1817 Greene Co., NC d: ?
Mary Polly Fields b: 09 Dec 1817 Greene Co., NC d: 28 Nov 1906 Weakley Co., TN
Martha Ann Fields b: 03 Feb 1821 Greene Co., NC d: 21 Jan 1896 Weakley Co., TN
Michael Fields b: 1825 Greene Co., NC d: ? TN
Seth Fields b. aft. 1825 Greene Co., NC d: 08 Mar 1887 Weakley Co, TN

I'm in NC and can't get to RI to do any research...can anyone help me, I've been dead ended here for a long time!