I personally recommend starting to read as soon as possible, but just know that it will be difficult and time consuming. Also, I would start working on grammar now since without any grammar knowledge it’ll be even more difficult. You just kind of have to mentally prepare yourself to basically look up most words and grammar. Depending on the day and what I’m attempting to read a couple pages can take me an hour, but when I do recognize a word or sort of understand, it does feel really rewarding. As for a book recommendation there was a beginner book club a while back レンタルおにいちゃん Reading Club
That I personally think seems pretty good for an intro manga, but you can also look at other books in the beginner book club threads. It also has a vocab list and grammar list, so you could spend time learning the vocab and grammar first and then attempt the book, which may make the reading easier and less demoralizing if you are worried about feeling discouraged.
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