I've been very inactive for years (lots of sitting) and my whole body is very weak and messed up (imbalanced muscles).

I don't know anything about exercising or stretching, never to been to the gym, and have no knowledge on what I need to do to use my body properly.

I've looked at the primal blueprint fitness book and read lots of articles but it all seems mostly for people who are already versed in all of this stuff.

Im already doing walking/sprinting and doing the exercises for getting into barefooting, but Im at a loss on what to do with the rest of my body.

What else should I be doing to get my whole body physically healthy? Where should I start if Ive been inactive for so long?