pick something that you actually want to read. it is going to be a slog for a while, so at least let it have some fringe benefit.
manga might be a good start, because you have part of the story told by the drawings. on the other hand the text is all direct speech, and the grammar might be very loose.
i don’t think furigana are essential, they might almost be a hindrance to learning. when i’m reading a text with furigana and there’s kanji i don’t know i focus almost entirely on the furigana, and later find that though i’ve learned the sound of the word, i don’t recognise it in text. when reading without furigana, i actually concentrate on the kanji.
also re furigana: you’ll need to learn how to look up kanji anyway. so why not start now?
also consider the subject matter of what you want to read. casual topics about everyday stuff will be easier to read than more serious texts about more specialised topics.
despite having read quite a bit already, i also find blocks of text (e.g. wiki pages) quite intimidating. i’ve been training myself to just look at one paragraph, and see if i can understand anything. and it’s getting better. but for now, when i see a page of text, my mind still starts by just going blank for a moment.