Reddit reviews Simplified Sight-Reading for Bass

Just learn to read music.

I've been working through this book and it's really good

https://www.amazon.com/Simplified-Sight-Reading-Bass-Instruction/dp/0793565189

I hear that Simplified Sight-Reading for Bass (by Josquin des Pres) is awesome if you want to learn sight reading quickly.

Definitely start with sheet music. Pick up a couple of beginner's books (I'd recommend Hal Leonard which uses fairly conventional notations and starts from absolute basics. Since you can already read, start the metronome and run the basic exercises until you can happily find some notes.

The bass bible is also very good, and was an indispensible tool for me learning, but it's tied tab/notation you have to consciously avoid the tablature if you want to get anywhere with learning to sight-read for the instrument.