Please don't use the samples, they're awful because they're outdated. And never use Tyranitar, it's trash now. You don't need Necrozma/Yveltal/Arceus-Dark on every team, though they usually are ran on most teams. Calyrex/Zacian are not the "premier" offensive threats, that's overwhelmingly overrating them. Teambuilding is pretty damn free if you know what to do and how to go on with it. If you're a beginner you'll have issues but it'll be pretty easy, especially if you have high stake tournaments than the ladder in mind.
Strictly speaking, you're either offence or bulky balance. BO's work fine but they're pretty dreadful for the ladder. (Passive balances work better than Rayquaza BO.) Fwiw run Swords Dance Arceus-Ground on your first few teams with Ditto + Arceus-Water and you'll be fine for the most part.