@slickstick, congrats, and great looking boat!
What everyone said here is spot-on so far; you don't need ez plugs, always turn engines off if you're walking away from the helm, and always keep a sharp knife on board... at some point you'll suck up a tow rope or dock line, and you will likely need to reach into the cleanout port and saw through it if it's wound around the impeller shaft (been there). TIP - You can minimize this risk with dock lines by cutting them shorter than the distance between your front cleat and the intake grates.
If you're a new boater, I would not recommend unplugging your trailer plug - I think it will cause you more issues than the risk of a burnt out bulb that is easy to replace. The reason is that your trailer plug is critical to going in reverse. Trailer breaks work as a result of part of the trailer tongue sliding back when there's pressure, to actuate the hydraulic brakes. This happens automatically anytime you break, the pressure from your vehicle slowing and the trailer tongue getting compressed, creates corresponding pressure that is applied to the trailer brakes. It would also happen if you backed up your vehicle in reverse, the trailer brakes would lock up - IF not for a signal from your vehicle which goes through the trailer plug when you're in reverse that tells the trailer brakes to not engage.
If you disconnect your trailer plug, but then try going in reverse, the trailer brakes will lock up. There is a manual way to disengage the trailer brakes for this purpose, a small clip that hangs off the side of your trailer tongue that can be put in... but then you need to do this every time, and also remember to REMOVE it when driving on the highway, or you will have NO trailer brakes.
Therefore, save yourself more potential headaches, by just leaving your trailer plug, plugged in.
I'm a first year boater like yourself. I was looking at your pictures and it looks like you've got the stock bow roller, and no steering upgrades. In my opinion, the most valuable first upgrades to me as a new boater were in this order:
1. Trailer Guide Posts: makes it WAAAY easier to load the boat back onto the trailer, plus you can see them sticking out of the water. Low speed steering and thus loading our boats is very difficult, but this helps a bit. You can get lighted ones like I did, so you can see easier at night too!
2. Cobra Jet Steering Kit: The only upgrade that actually helps the boat steer better at low and high speeds. Our boats need all the help they can get in this department.
3. Bow Roller: One of the easiest/cheapest upgrades. The stock yellow bow roller scratches up the bow of the boat, so replace this sooner than later.
You can see links/install videos for what I'm talking about, in my footer below. Make sure to make a checklist for yourself before taking it out the first time, don't forget to put the cleanout plugs, drain plug in, and release the transom straps!!