A good place to start is the library catalog, which searches across all the libraries at W&M (including law school & business school), and also includes the materials at the Colonial Williamsburg Foundation library.
General tips:
For this class:
Start by searching your individuals name in quotation marks.
"James Blair"
"Richard Bland"
If you're looking at someone with a generic name, add an extra keyword with AND
"John Smith" AND Jamestown
Limit the results to books, ebooks, chapters.
For books with context about the individual's time period, try only a few keywords:
Virginia AND history AND jamestown
If you're really stuck, you can search in WorldCat and order books (Free of charge) using ILL