Here's a kind of crappy sketch to illustrate the basic principle behind balancing a pattern - the pencil represents the front bodice pattern piece and the green line represents the back bodice placed over the top.
Doing it small, without the gridded dot paper I usually use meant that thiings ended up a little out of proportion, but I think you'll get the idea. Basically you want you back to be parallel with you front, but 1/4" tp 1/2" smaller. You lay the back pattern, face down, over the front pattern, liing up the center fronts and center backs (which generally will also be the grain) as well as the waist and bust lines. Tke your shoulder lines and move them so that they are parallel with each other with the front bigger than the back, but make sure as you move them you're not changing the measurement of the armhole or neckline.
Do the same with the side seam, again, making sure youre maintaining the same total original measurement. This is sometimes easiest if you draw a line directly in between the two lines, trace it off with a tracing wheel, and then re-draw your side seams, etc, the desired distance inside or outside of that line.
Theat's the basics, more to come.