Creating a car dealer website

hi guys i am pretty new to WP and i would like to create a site for a New car dealer,
basically i would like to know which would be the best method to list car makes and models,

here is what i am thinking please let me know if there is a better way,

Page>>> Inventory (main page for inventory which some info text etc,,,)
Category>> Makes ie Mercedes, Audi etc,,,
Post>>> individual car unit, eg BMW 520i

does any body have any tips on how i would achieve this ?