The last and most important part to this method is the application of the 3rds to the line. Placing the thirds into the walking line is crucial, this is because the 3rd tells the quality of the chord (major/minor). Be careful that you are using the correct 3rds on the chord, it is my suggestion that you have a good working knowledge of triads on the finger board. Also remember there is nothing wrong with playing the same note twice, alot of new jazz bassist feel that every note has to be different than the one before it, this is not true simple is more often better and the people your playing with will be able to relate to your playing better. This is by no way a complete method for learning to walk but rather a jump start into the world of walking bass. Have fun!