So, you have the alphabet memorized now? Where do you start learning the language?
I'm going to stick with ancient Greek and/or Koine, but some of these have good Latin content as well.
I can't say enough nice things about Luke Ranieri and his Scorpio Martianus and Polymathy channels on YouTube:
Feel free to look around, but a good place to start is his Ancient Greek in Action series:
He uses his reconstructed Lucian Pronunciation of Ancient Greek in the videos, but there are other videos that talk about other reconstructed ancient pronunciation. (I'm gravitating to his reconstructed Pompeiian pronunciation, but I am still liking Sidney Allen's reconstruction from Vox Graeca).
If you want an IN-DEPTH discussion on the best ways to learn Ancient Greek or Latin on your own, may I suggest (and one of these includes Carla Hunt of Found in Antiquity:
If you want a VERY traditional way to learn Ancient Greek, there's the 118-video series from the Center for Hellenic Studies with Prof. Leonard Muellner (Professor Emeritus of Classical Studies at Brandeis University) and Belisi Gillespi, his teaching assistant:
The most important thing is just... start somewhere! Explore! See what works!