I would suggest at least a few months with a teacher to get the fundamentals right.
My favorite bass learning series is strictly strings for string bass, book 1 to 3, from Highland/Etling Publishing (belongs to Alfred Publishing).
Book 1 has ISBN 0-88284-533-0, Book 2 has ISBN 0-88284-539 and Book3 ISBN 0-38081-13952-2. Hope, the books are still available, I have had them since last century...
The pieces in them lead to playing the instrument, enough theory, scales, chords etc build in to get the needed knowledge.
There were other books in the series for string ensembles, play alongs, christmas songs, classics and such I never had, but you could have found additional material for your level there.
Fingering is Simandl, but much faster progress up the neck.
My favorite bass learning series is strictly strings for string bass, book 1 to 3, from Highland/Etling Publishing (belongs to Alfred Publishing).
Book 1 has ISBN 0-88284-533-0, Book 2 has ISBN 0-88284-539 and Book3 ISBN 0-38081-13952-2. Hope, the books are still available, I have had them since last century...
The pieces in them lead to playing the instrument, enough theory, scales, chords etc build in to get the needed knowledge.
There were other books in the series for string ensembles, play alongs, christmas songs, classics and such I never had, but you could have found additional material for your level there.
Fingering is Simandl, but much faster progress up the neck.