At 165 lbs. you could do well on either the Rio M or Rio S as a first board.
Any board with at least 160 liters of volume will work, and for the light winds in
the Baltimore/Annapolis area a centerboard/daggerboard will be helpful right a
Something in the 75-85 cm width will be better for cruising in light winds.
The ultra wide Start type boards would be the easiest, but will not give real good
performance and help you advance your skills quickly in super light winds unless
you choose some fairly large sails.
If you get down to Hatteras (after they re-open the island) look me up and we can
get you going very quickly. The BABA and WET folks will know how to find me.