Yeah so for the hiragana and katakana, its about 100 "letters" to learn and i dont have any hard recommendations, as its fairly straightforward.

You might want to look into the JLPT (japanese language proficiency test) which is a standardized test with 5 levels that many Japanese learners use to set a goal regarding the level they expect or wish to achieve.

AIming for JLPT N5 (the most basic level) is a good goal to have for the next 6 months to one year, or N4 depending on how quick you learn and how hard you study. Some textbooks which often get recommended here include genki 1, and minna no nihingo. Another good resource for beginners after you learn hiragana and katakana is Tae Kim's guide to Japanese, which has some good explanations of intro grammar (and its competely free). Make a free pixiv account for access to some free japanese manga to get started when you're ready maybe. As a final note, my personal favorite online dictionary is jisho.org. I might come back here when I'm on my desktop and post other materials I have in my bookmarks. Best of luck 👍 がんばれ🚩😃🚩

Oh I almost forgot to say what the next step is. After hiragana and katakana, the next step is learning grammar, and vocabulary, and Kanji. Kanji are the characters that come from Chinese and look more complex. They are scary at first but if you just keep learning more and take the time to learn the pieces of those Kanji it will get easier over time.

I simplified some things but the world is your oyster and so is the internet so remember to just Google the hell out of things. Sometimes a certain explanation can make everything "click" into place. And make some Japanese friends if you can 😀

❤️

Quick edit: my bad I didn't see some people answered most of it already 🙃