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Dear Mr. Thompson,
Thank you for posting your request on History Hub!
Information about which unit your ancestor served in may be included in the military service records, pension files, and other military records in the custody of the National Archives at Washington, DC - Textual Reference (RDT1). See the following webpage for information about Requesting Copies of Older (pre-WWI) Military Service Records. For questions about these records, please contact RDT1 via email at firstname.lastname@example.org. The National Archives also has a topic page with information about researching the War of 1812.
Both the Regular Army and the Virginia Militia recruited in the state of Virginia during the War of 1812. The Virginia militia was organized by county, with each county producing one or more regiments. These regiments were in turn organized into twenty-one brigades, and the brigades were organized into four divisions. With the outbreak of war, President Madison called up the state militia, with each state satisfying a particular quota. The Library of Virginia has some records concerning the service of members of the Virginia militia during the War of 1812. Please see their research guide regarding Soldiers of the War of 1812.
Also, FamilySearch maintains a research guide for Virginia in the War of 1812. Helpful books include A Guide to Virginia Militia Units in the War of 1812 (1988) and Virginia Soldiers in the United States Army, 1800–1815 (1986). The Society of the War of 1812 in the Commonwealth of Virginia may also be able to assist you with your inquiry.
We hope this information is helpful. Best of luck with your family research!