What decks should I begin with?

I'm a eturning TCG player, and apart from the decks I have in the beginning, I have the Keldio vs Rayquuaza decks and got the Ice Rider Calyrix VMax, Original Forme Palkia VSTAR and Bright Tide theme deck. I had about 50-70% success rate so far with most water decks (Except Bright tide theme deck). What deck should I get or make next? I bought those decks cause I love the Keldio Ex deck and wanted something similar, but I'm not having much success now, an am willing to learn different types if I can find good decks.
Disclaimer: I have absolutely no idea how to make a good deck. If you could explain any math behind it, that'd be great (if you can, of course)
Answers
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If you want the best overall deck try to go for Gardevoir ex deck, also isn't that expensive comparing to other decks that require many ex Pokemon.
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I think that one of the most straight foreward decks to pick up is Charizard EX / Pidgeot EX. I don't like calling it "easy" but the floor of piloting the deck is relatively low, playing it well still takes practice and talent etc.( I currently play this deck so I may be a little defensive calling it simple. haha)
But from there you could gradually edge towards a Charizard EX/ Dragapult EX deck if you wanted to with minimal cards needed. If you would like my simple Charizard Pidgeot deck list here ya go:
4x Charizard
2x Charmeleon
3x Charizard
2x Pidgey
1x Pidgeotto
2x Pidgeot EX
1x Fezandipiti EX
1x Mew EX
1x Budew
1x Tera Orb
4x Brocks Scouting
1x Maximum Belt
2x Big Air Balloon
2x Artazon
4x Bosses Orders
2x Iono
3x Arven
2x Super Rod
1x Defiance Band
2x Fenne
l3x Buddy Buddy Poffen
4x Rare Candy
12x Fire Energy
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