Being that you can play guitar is a plus. I can play both, bass and guitar, so I often use the guitar in formulating a solo piece, then transpose to bass in a way that makes sense. I'm never afraid to go to a higher or lower octave/register to accomplish what I'm trying to get across -- as long as it sounds right to the ears. You will likely use chords or chord structures on the bass, with solo bass. The only guy I can think of, off hand, is Zander Zon, on YouTube. Check out some of his solo stuff.
Greetings. Can I assume that "Bass Fishing in America" is a little nod toward the Richard Brautigan novel "Trout Fishing in America"? Anyway, thanks for your reflections on transposing music to the bass. I haven't done this before, but I have transposed a lot of music, so I'm not afraid of the idea and I agree with you completely: if it sounds right, go with it. All best, R.