The standard Popsicle, 8 inch skateboard deck is a good all round size for any skater. Particularly if you're not sure where to start. Deck size is a personal preference not really related to foot size. Narrower decks will spin faster on flip tricks while wider decks tend to be more stable and suited to large ramp and bowl riding.
If you want a Popsicle deck in another size check out the Other Sizes section.