Not knowing anything about your own level of accomplishment makes this difficult to answer. Given the amount of songs and time, here’s what I would do: Make a cheat chart for each song I’ve never heard before. It would show style and tempo up top, all chords for Each section, a sample rhythm written out for each section, and notated signature licks. It would be laden with dynamics, articulations, and helpful text where applicable (Half time in verse, Driving Eighths, building, etc.) For lots of experienced players a chord sheet and style is all that’s required to fake a bass line, unless they are expecting recording-faithful parts.