+1 - take a boating class. on water if possible. either way, get out as much as you can and practice maneuvering/docking. this is useful for your "first-mate" as well to help learn together how you approach docking, tying up, etc. trying to dock with stress is bad and leads to mistakes. Once you get the hang of it, get out and do it again when windy (or changing tides if that applies)
+1 on the anchors... but it depends on where you boat, the depth you anchor, and the bottom... I just got a box anchor, but previously used a mushroom anchor to hold in 10-15 ft depth swim coves. i'm in a 24' Tritoon, and when it was above about 8 mph winds, I'd drift sometimes. The box anchor will solve that, and I now have a second anchor to hold the back if I want. special note: the box anchor is heavy...
+1 on the mirror, best investment ever... word of advice. mine broke because i would just lower it and put the cover on. one time the glass was against the top rail and the glass broke. either be more careful than me, or remove the glass when storing, lol.
Get a second battery. Boats love redundancy. If you don't already know how to hook it up and work it, ask the dealer to install and explain how to use it properly (you can burn up the alternator in the motor if you don't watch what you are doing). being able to get started up after anchoring and playing tunes for a while, is great peace of mind.
I recommend inflatable floats for swimming when anchored rather than foam stuff like the lili pad... it takes time, but space on a boat is hard to come by, and rolling up and travelling with a lili pad is a PITA.
Consider a combo blower/inflator for those inflatables rather than a dedicated inflator. I got this since I'm all DeWalt at home:
https://www.dewalt.com/product/dce100m1/20v-max-compact-jobsite-blower-kit?tid=579381
It's a nice combo that is very helpful to clean the boat and inflate toys.
Get a dry box. Yes there are compartments that are supposed to be watertight... until someone soaking wet sits or leans in the wrong place. assume any storage can get wet, and will... in fact, check regularly to open things up and make sure they dry out or you'll end up with mold. Not a huge problem, but something to check occasionally.
+1 - take a boating class. on water if possible. either way, get out as much as you can and practice maneuvering/docking. this is useful for your "first-mate" as well to help learn together how you approach docking, tying up, etc. trying to dock with stress is bad and leads to mistakes. Once you get the hang of it, get out and do it again when windy (or changing tides if that applies)
I said take a class twice... it's that important... and operate defensively. always. 90% of boaters on the water are idiots and will not be doing the same.