I have two pdf files on the Walkingbass website now. They are: 1) Beginning Walkingbass - covering such topics as: How to set up the bass, choose an amplifier, get the tone you want from it, and the basics of how to play the instrument using barr chords.
2) Intermediate Walkingbass - covering such topics as: Inverted chords, minor and seventh chords. An introduction to scales, and some other little tips to bring you playing up to the "playing in public" level.