First try reading a book like the course by ed Miller, try to play with play money on pokerstars. I know many people would say it make your game worse but actually you can learn the basics and prove your theories without losing money. Then i would suggest playing with real money and start with more advanced books like essential poker math by alton hardin and the grinders manual by peter clark, theres also a lot of videos on YouTube. don't suscribe to run it once, it's for advanced players and you would struggle a lot understanding, there's a series from run it once that is called 'from the ground up' i think it's great for beginners. Any other doubt DM me.

Book: Mathematics of Poker
Essential Subscription to RunItOnce: Pro Videos (From The Ground Up)

I think the most important thing once you decide to get good at poker is to work on everything. So my advice would be; begin everywhere, do not be afraid to read, watch, think, write anything.

I remember starting out, I read one of sklanskys books 3 times back to back in a few days, then I played a ton, read every thread I could find on 2+2 and then joined a coaching site where I watched every video I could get my hands on (im easily talking about 100s of them). If you want to become succesfull, dive in head first and discover this beautiful game from all angles and different perspectives.

Start right now, just filter the videos for what game you want to lear, If you think the coach is good, whatch every single video by that coach, and take notes!!!