The first step is identifying either the General Assembly number or year that the legislation was introduced, the bill number assigned to the legislation, and the committees that reviewed the bill. The following resources will help you find this information:
Acts of the State of Ohio/Laws of the State of Ohio. [Ohio Docs 345.12 OH3]: these are indexed by subject (the Ohio General Assembly’s website has the Acts from the 122nd General Assembly of 1997/1998 to the present).
Ohio Revised Code (http://codes.ohio.gov/orc/) can provide the date of the legislation.
Bulletin, General Assembly of the State of Ohio. [Ohio Docs 328.771 Oh3L]: this includes a timeline of the legislation (the Ohio General Assembly’s has posted online status reports from the 115th General Assembly of 1983/1984 to present that include a timeline of the legislation).
House Journals [Ohio Docs 328.7711 Oh3j] and Senate Journals [Ohio Docs 328.7711 Oh31j]: these are a record of the daily activities of both chambers (the Ohio General Assembly’s website has journals from the 125th General Assembly of 2003/2004 to the present).