Posted this last week myself. Try HelloChinese (likr Duolingo but good until you hit the early paywall) and Pleco (dictionary). Oh also downloaded a HSK1 book and been reading it along

Will probably buy one month of HelloChinese

Integrated Chinese is your best bet for a textbook. Pleco is a must-have app if you have an Android. Some people love anki for flashcards, some people hate it, just don't get into a trap of spending all your study time editing cards. You Can Learn Chinese is a pretty good podcast about what/how to study; a lot of my advice comes from them.

The three paid resources I've heard most recommended are chinesepod, yoyochinese, and skritter. If you have a little money to spend and are serious then hiring an online tutor for an hour or two a week is highly recommended.

I strongly recommend against duolingo and Memrise for Chinese.

ive used pimsleur before to develop very basic conversational skills for survival needs. like a baseline for asking for help, identifying oneself and the basic situation you are in. which also helped trigger my ear to hear language patterns instead of inscrutable sounds.

I did some basic Italian (🤌🏻🤟🏻), Spanish (to refresh for a trip), and Japanese for specific situations I was getting into. I like the structure of the lessons and starting conversationally, which is how humans enter into language anyway. I also like being a parrot and imitating. Italian is hilarious. I tried pimsleur mandarin just for the hell of it and struggled a lot with the tonal stuff, but also had nothing pressuring me to learn it and had no way to practice, so I didn't keep up with it. I'll probably try again, especially if I ever meet a native speaker I can practice with.

anyway, pimsleur is pretty easy to try, at least. but, even if you crush it, you'll be illiterate... so? probably multiple tools are gonna be necessary.

I heard good things about Skritter to learn hanzi, I downloaded it but haven't used it yet. Will do it right now, in fact and report back in a few moments

Edit: tried it, it's pretty good but the vast majority of the content is paid and way too expensive in my currency. I think a subscription would be worth it if you have USD, though.

I collected some resources here

I have been using Memrise (not for Mandarin) and it has been decent so far, it's like Duolingo but it also has video lessons embedded

seconding Pleco, it has spaced repetition flashcards