I hope you get a good teacher, I had lessons for about 3 months last year and it helped a lot. I only stopped because I couldn't afford to continue, but the instructor I had was a monster player, great soloist, and reads sheet music incredibly well and theory is his thing. He always had his lessons planned and gave homework, and we'd continue on the next lesson. I'm about your age, and it was almost overwhelming.
His pointing out some errors I was making with both hands while playing stuck with me, and he got me back into reading music daily. The fluidity of the instructor, how fast and easily he can work the fretboard blew me away. He can make something really hard look easy. Lots to be said about proper technique, guys at that level move their hands very precisely and conserve energy and that way can do more with less effort.
I bought Jeff Berlins "Bass Mastery" and play etudes from it daily, it's been nearly a year and I have 2 more chapters left and I'll finish the 1rst lesson program. I plan on continuing with Berlins next in the series. Playing the etudes in Berlins work is good left hand work, thinking about fingerings and efficiency. I still jam in a band and learn songs, but if I don't practice the sheet music daily, I feel as if I'm not advancing in bass playing.
Good luck, never stop learning ! Here's where I'm at now, key of C no sharps or flats
