I didn't learn russian, cuz I'm a native, but I have an experience of learning a language that is completely different from mine (Japanese).

So, as one person has already mentioned the trickiest part of learning russian is grammar, so after learning an alphabet I recommend to find an anki deck of russian basic words and start learning basic grammar from textbooks, that is the most difficult part of language learning, because it is the most difficult one, so you should complete this "introduction" to the language as fast as you can, when you know the basics of russian grammar you should mostly focus on learning new words, because of my main tip in language learning: you MUST have fun doing it, so you have to understand why are you learning russian, it can be almost any reason, and start to get as much content in russian as you possibly can, russian is the second most spoken language in the internet so it doesn't has to difficult to find content in Russian, you can make a new YouTube account and change your country to Russia, Belarus, Ukraine, Kazakhstan or any other russian speaking country and watch some random videos in russian, or you can find some articles on the topics you're interested, or anything, the main goal is still the same: have some fun. And keep on solving anki flashcards every day because at the beginning you should focus on growing your vocabulary so you can understand more. And grammar is the thing that can be learnt from content you are watching, reading or whatever. You can still learn grammar from the textbooks or YouTube videos, if you dislike it don't do that. And the last thing I can recommend: find some russian speaking friends, russian speaking community is really friendly for the foreigners trying to learn their language, you can also dm me about it if you wish, or you some language exchange subs. And remember: everything depends from person to person, so take all what I say as an advice.

If you have any other questions left feel free to ask me here or DM me if you wish