I can't argue with Jadeo's advice... 300' plus a minimum of half your boat's length in galvenized 3/8" Proof Coil chain should work fine.
A 12 lb Danforth anchor will work fine but a Bruce or CQR plow anchor would be better...and a little heavier on your wallet as well.
Finally, get an anchor float system to pull your anchor.
Come look me up at the Seattle Boat Show and we'll get you all rigged up!