Nah...take the zen approach. Do by not doing anything consciously. In the beginning, just let it happen on its own. Start playing and hanging around a few guitar players and they will show you some stuff without you even asking. That's how lots of old time blues players and country pickers learned. Pretty soon you will have gathered enough basic knowledge to begin forming more pointed questions pertinent to what You want to know - not what someone else thinks you ought to know (which they determine for you because it's based only on what THEY know...or based on the fact that they know it and you don't, and they want to impress you with their knowledge)...

As far as that super-tonic ..inter-dominant submediate stuff. I transpose all the time and I have no idea what those terms mean. All you need to know are the first seven letters of the alphabet and how far apart one is from the other.

Let's say you have a song with the chords C, F and G in it. Perhaps you can't sing it with those chords but you like it fine when it starts out in G. The distance between C and G is 5 (C=1 D=2 E=3 F=4 G=5) Move the other chords up 5 as well so that F becomes C (F=1 G=2 A=3 B=4 C=5) and G becomes D (G=1 A=2 B=3 C=4 D=5). Shazaam...you've transposed C, F, and G to G, C and D. You'd probably fit right in with Merle and Willie and Hank Williams, Jr.

Anything more complicated than that and you're probably hanging with the wrong crowd, such as piano players. They like 'flat' songs...stuff in the key of B flat, or A flat, or D flat...it must be something about the way the keys are laid out on a fingerboard. If you're lucky you might get them to play something in the key of F, but that's about as much as you're going to get them to compromise, and that only because it's got a B flat chord in it.

But they'd probably be impressed if you knew the submediant triad in the key of E flat minor....