These 2 sites will help you a lot.
http://www.studybass.com/ http://scottsbasslessons.com/
Its easy, you just have to put work in. Remember
Big
Cats
Eat
Fish. There are no sharps between
B and
C or between
E and
F.
Learning the Major and Minor Triad patterns will start making a lot of sense of it, and is explained very well in the 2 sites I listed. Check those out and report back to us
The higher register makes for a great tool to add dynamics. I use it a lot in song intros,endings, slides from low to the same note an octave up on big builds, not just for Jazz and soloing.