As someone who tried to do the same but got sidetracked, this was my plan. Someone who actually went through with learning the language can probably judge if it is a good one.
1) dont spend a single minute learning how to write, other than maybe practicing hiragana/katakana writing to help with memorization. Fuck stroke order, fuck that shit. You are realistically never going to write a damn word of Japanese.
2) start by memorizing hiragana, then katakana. Its actually easier than you think. Start with a row, and every day or two add another one. Just keep at it, nonstop flash cards, whatever you need to do. Just memorize them.
3) to aid in memorization, learn some basic words (colors, numbers, etc) because actually having to spell out or read a word really helps with the memorization.
4) start with grammar. Learn sentence structure and all that jazz.
5) while doing this keep learning the phonetic spelling of more and more words (thus being able to read them in hiragana/katakana, and speak them out loud)
6) only once you have a very good vocabulary and a strong understanding of hiragana/katakana should you start learning kanji. My thought process: (from my understanding) you can read and write every single Japanese word in either of these two syllabarys. And on top of that, there is only one way to say the words, and hiragana/katakana actually exactly tells you how to pronounce them. Its just a fuckton easier (imho) to use them to learn words, because you are learning the actual pronounciation of the word, instead of learning a single character that represents a word. Thats is one of the cool parts of Japanese I found, that hiragana and katakana are basically like the building blocks of how you actually speak the word. Its like the difference between reading the word "house" and there being a picture of a house. If you understand letters you can easily read and speak the word house, and know how the word is constructed, even if you have never seen the word before and have no idea what it means. If you only memorize that the picture if a house means house, you are missing the fundamental aspect of why the word is pronounced that way, and just know to say house when you see it (and if you have never seen it before, you wouldn't even know how to speak it out loud).
7) my second reason for prioritizing hiragana/katakana - anything geared towards children (like videogames) are usually entirely in a syllabary, and don't have any kanji. And if they do have kanji, they have furigana, which is essentially the hiragana spelling of the kanji above it. So many games, especially Nintendo games for instance, you will be able to read entirely without even knowing kanji. Granted, many of these will have already been translated, and the actual games I am guessing you want to play will have kanji, but it allows you to at least practice and show progress with an actual video game.
Anyway I have no idea why i fucking wrote that much, and my advice is probably contrary to many others since most people say start memorizing kanji immediately, but hopefully something in there will help you.
Edit: another reason for starting with hiragana/katakana is its like a personal test. If you cant bring yourself to memorize roughly 80 characters you sure as fuck arent going to do 2000. And if you only even get this far, at least when you are playing Yakuza and see a sign that says うどん, just by being able to sound out the hiragana you know what the restaurant is.
Also, if someone wants to critique this approach please do, if I ever give it another shot I'd love to do it the best way possible.
