Authenticity
In addition to deciding on the type of garden, the gardener needs to decide on the degree of authenticity.   The plant selection can be limited to varieties which were available during the Elizabethan age, or it can include modern cultivars which have the right "look." 
See Notes on Specific Plants for help finding heirloom varieties or modern substitutes.
For help with garden layout, look for period illustrations of gardens or visit recreations of old gardens.  Also, scientists are increasingly interested in studying  historic plants and gardens.  Find their publications.  Most of the mass market books about heirloom plants are not very specific and deal with a later time period.  Check the credentials of the author and look for a detailed bibliography (or, better yet, footnotes for each chapter). 
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