Congrats on your new ride. You will hear both options from guys here. I added a 2nd battery
Odyssey PC925L and used a
true battery isolator to separate from the stock battery.
Also used a
blue sea system fuse block and a
stinger isolator that I hooked up in between the 2nd battery and the fuse block. The stinger isolator is activated by a master switch so that I can shut off all drain on the 2nd battery.
There are some that use a Busman to distribute power to accessories but I ended up not having anything that drew more than 15 amps so I went with a fuse box.
There are lots of ways to do the 2nd battery and searching the different build threads will give you multiple ideas. My biggest piece of advice is to sketch out what you want to do before you do it and plan for future accessories