What Deck Setup Should I use?

I’m fairly new to the game. I play it here and there. What are the number of each mana cost you should have? Like I know you don’t want all cards with one mana but not sure how much to put it, so im not stuck with a bunch of cards I can’t use.

https://us.forums.blizzard.com/en/hearthstone/t/player-guide-work-in-progress

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Realistically, if you’re very new and don’t have at least a couple of legendaries, you should start a new account to take advantage of the free deck they’re giving players from the 26th onwards.