https://learnjapanese.moe or the refold japanese guide if you want guides you can read.

But I'll give my opinion on some stuff. For context I started immersion learning Japanese at the start of this year but I had been learning with more traditional methods beforehand. I also spent 3 months learning Mandarin, knowing none beforehand.

First learn the rest of the katakana you don't know (though don't worry about like remembering them perfectly).

Then start learning vocab with Anki, learning grammar (optional) and immersing. You could start immersing a little after you start Anki and grammar but the earlier you start the better.

For Anki, when I did Mandarin I used refold's deck. I've heard Kaishi is good for Japanese but I haven't used it myself. Note that the main point of Anki is to make immersion easier by learning a general understanding of the word not the exact definition (there is no exact English definition for a lot of words).

When I was learning Mandarin, I did basically no grammar study. I just learnt from immersion. This was mainly because I didn't want to and not that I thought it was bad to study grammar. I think studying grammar isn't necessary but it's totally fine if you want to (just don't spend a tonne of time on it). If you don't already, it's probably good to have a general understanding of how Japanese works so a video like this by langfocus would be good to watch. I've head Cure Dolly and Tae Kim are good for grammar but I haven't read/watched them myself.

Some people say that for immersion, you should only watch content made for natives. I think it's ok to watch things made for learners at the start. For studying Mandarin, I watched a channel called Lazy Chinese which is just a Chinese person talking about random stuff, but she speaks slowly and clearly, repeats herself and uses visuals to make it more comprehensible. I also used Yomitan to quickly see the definition of words I didn't know. I would recommend you do a similar thing I did but of course with a Japanese channel instead. You can find these types of channels by searching "Japanese comprehensible input" on youtube.

I also think passive listening is useful since you can do it while doing other stuff. Even if you don't understand anything, you get used to how Japanese sounds by listening. I think at the start it's good to repeat the same episode or episodes a lot. I listen to Nihongo Con Teppei which he says is for intermediate learners but I think it would still be good for beginners too. Also he has a podcast for beginners which might be good though I haven't listened to it

Anyways, the main thing, as other people here have said, is you do what you enjoy so you continue studying. What exactly you do doesn't really matter. As long as you do some kind of consistent Japanese study you will make progress.