To know the mathematical scale length of your bass you measure from the bridge side of the nut to the 12th fret then double the measurement. 33.5" is essentially a long scale bass and standard (often what is referred to as "long") scale strings will work. FWIW Fender/Squier uses 34" scale length reliably - I bet your bass has a 34" scale length.
Being flat or sharp along the fret board and from string to string is an intonation issue, and too much or too little curvature/relief in the neck is a truss rod issue - both solved by a good setup. This is best left to someone who knows how to do it if you've never done it before.
I am; Kalium LLC - formerly KnuckleGuitarWorks.com & CircleKstrings.com