Sword Art Online, now that i went back to it, its pretty trash ntgl, but still very enjoyable, specially the alicization arc, i think thats the best one.
I do believe it was Code:Breaker. Can't be a hundred percent sure though cause it was a while ago. I know that Digimon and Fairytail are also both up there with anime that I watched early on.
I'm not too sure what my first anime was exactly, but one of the first was Ponyo, that my grandma bought for me. So basically my grandma was the one who got me into anime in the first place. Thanks Gran!
My first was technically Pokémon Best Wishes (I really have to rewatch the entire Pokémon series at some point haha), but the first I actually considered to be anime (if that makes sense?) would be Ouran High School Host Club for me :)))