It's a little hard to know where to start without knowing what your musical background and knowledge is. Can you read music? Do you know any music theory at all? Not that you have to have any formal study of music theory, but to do any arranging, you do have to know some (even if you don't know that's it's called that). Case in point:   are you familiar with the Circle of Fifths? What chords go with which keys?

Do you play with your right-hand fingers or do you use a pick? You can do a lot of things with a pick, but for real variety in rhythmic patterns, you really need to be able to play with your fingers.

Anyway, give me a rundown on what your musical knowledge and guitar skills are and I'll see what I can come up with.

Don Firth