What key is your triple row in? I've heard from Joel Guzmán that a lot (not all) of the Country, Americana, and Blues work he does with artists is in the key of A or E. Also, the chord book you bought, what keys does it show you to play in and on what accordion? I know you mentioned it shows mostly on the pull but does it include thirds, sixths, inversions, etc.?
Karlos,
My triple row is I in GCF which I borrowed for the purposes of learning. Ultimately I'll be choosing an instrument to suit my vocal range which is usually in D. The book illustrates scales in A,A#,B,E,C,C#,D,D#,F,F#,G, andG#. Also included are progressions in thirds and sixths and all the chord shapes. A good place to start I think.
Charlie