Self taught "pianist", played casually for a year and now want to get serious. Where do I start?

Hi,

About a year ago, I bought a keyboard with new found motivation to start learning piano. I've been playing on and off, and mainly been looking at videos and trying to memorize the keys and playing off of that.

I can play parts of pieces like Moonlight sonata, Fur elise, interstellar theme and a few other random themes. I really enjoy it but I've come to realize I struggle playing while reading the letters on the spot, so I do dozens of tries to try and memorize these pieces and play them as is.

I cant read notes, what I did to get around it was marking all my keyboard keys with the corresponding letters. Like G G# etc etc.

I've come to a point where I actually want to learn, cause I've skipped alot of important steps. I want to learn to read notes, and have actual technique, but I'm not sure where to get started.

Are there any suggestions or books that can help me get started at a beginners level?

Thank you!