I appreciate the suggestion, and have added a few bookmarks on C25k to my to-read pile.

Given my experience today, attempting to add some of the warm-up routines from /r/bodyweight's Recommended Routine, I'm afraid that it seems that I have a bit of a ways to go before I'm even at the level of 'couch'. Ah well; I knew what I was getting into when I started this, and am picking up as much theory as I can to adapt pre-existing routines to my circumstances.