Hiya Sully, just a few thoughts for you on a big topic:
A large part of your navigation planning is going to be managing tides and currents, more often than not the currents will dictate your departure and arrival at the next stop. Especially where you're going.
Be realistic in how much ground you can cover in a day. When you do your planning, think about points on the way where you could divert to, if the weather turns on you or you run into some mechanical issue. Consider unlimited towing insurance. One tow could break the bank. It's one of the best deals in boating imo.
Know your boat systems, and how you'll manage them: How will you keep batteries charged, replenish fuel and fresh water. Have essential spare parts: impeller, filters, belts. engine oil, trans. fluid, anti-freeze ( if req.)
Have a Hand-held radio?
Get into a daily routine of checking all levels.
Regarding horns...you can easily blow through one of those cannister horns a fog. I carry one of these too:
I'm working on an electric horn that runs off my radio.