I would go slow on the anchor system. The less lines you have, the less snags.
You might get by with a surface anchor attachment in California (to kelp). See:
A surface anchor and drift chute (great for jigging/ bait drifting with any wind-just attach midships and you can dangle your feet over the side while she drifts broadside to wind).
BUT first thing I would get before anything is a surf leash to attach you to your yak. The one thing you don't want drifting off if you huli(flip).
I have found a compass useful. If your doing any night work you'll need it. Back light LED requires 12V but you can tap off a light or FF system.
I reiterate what others have said. Try going light. You will find that if you pack astutely a 5 gallon bucket ends up as a junk/trash container.