This will be my first campaign I've ever DMed so I'm asking for a bit of help here on this one since I'm still very new to the game as well. I've roleplayed before, but the type I do is nothing like playing a game as in depth as Pathfinder/D&D or any other table top games. So many more rules to follow, and I'm still learning all of them, let alone getting used to the style of the roleplaying done in a tabletop game.
So far what I've gotten is it's a water campaign, the setting is on 5 islands, originally it used to be 7 islands but two of them sank. All these islands follow one government, and they all depend on each other for different needs. The center island is where the kingdom was built, the rest are villages/cities where they fulfill their duties.
When I was first putting this together I thought maybe the final boss could be a wizard and dragon working together, but as I went through the bestiary I found the Kraken. So I'm going for the Kraken instead because my group has used dragons and wizards so much it's ridiculous. The Krakens goal is to get a hold of two artifacts that are hidden in the ruins of the two sunken islands, which grant the bearer full control of the ocean.
My problem is, what type of lifestyle should I go for with this campaign for the islands, I thought about something similar to what Atlantis would've been like but I'm afraid it might not work out or it could be overdone.
And I need some ideas for the artifacts, I'm thinking about a crown and trident, but I'm not sure how they would work.