Music theory is actually pretty simple.......i've spent more time trying to do the 'easy'way of doing things, and tab, rather than learning theory. And theory is the simplest way to go. Check out the book "Music Theory for Dummies" You can skip thru, and cherry pick the stuff that you are interested in.....sure helped me alot. For transposition, the very easiest is a good music program......Finale makes one called Print Music. You can transpose, and even change the clef....