Welcome to the
club! Anyways, here's what I can say from my experience about Kirby.
First and foremost, learning Kirby will take a LONG time. Kirby's abilities give him an extremely high learning curve and because of it, he has mindgames to utilize. It is up to the players of Kirby to develop him into the "Star Warrior" that we idolize him as.
Secondly, just to get this out of the way,
you will lose a lot in the beginning. Whereas other characters are easy to pick up and win with, you need experience and some skill in order to win with Kirby. Sure, it will take more work, but nothing is more satisfactory than winning in an otherwise "bad matchup." So when you lose a lot, don't fret. Just take it in stride and learn from it. Perhaps just rest from Smash if it goes into your head, but aim to have fun.
I guess next is the actual techs and such:
I would heavily advise you to learn the "Hup Cancel," which allows Kirby to have virtually no landing lag when he lands as D-Air comes out (just FF before you "Hup"). This makes Kirby's mindgame options literally widen like a chasm because of it.
Make sure you also use Kirby's five jumps as a mindgame tool. The jumps can act as a pressure tool and even a deadly lure (chasing a Kirby above you is risky since he can Stone and KO you if they are not careful) when used in the right situations. Again, it is going back to the mindgame mentality.
Live and love the duck. Kirby's duck is downright ridiculous, being even lower than Jiggs (although Jiggs has Rest-punishing). The duck itself will allow you to punish moves and make matchups a breeze. Zero Suit Samus struggles hard on the ground against Kirby, since all but three moves whiff a ducking Kirby.
Finally, Kirby's pummel. I've found Kirby's pummel to be downright vicious, being not only the 3rd strongest pummel in the game (Jiggs beats it, and Luc must be at high % to beat it), but also one of the
fastest pummels in the game. Use Kirby's throws and pummels to rack up damage and force mindgames onto the opponent.
There's a bunch of other stuff as well, such as Inhale and whatnot, but it is 11 PM over here, and I need to rest, to be honest. Hope that helps!