Six Minute Mile, from Russ Sears
I recommend the article Run A Fast Mile, however, I would add a few things that they left out.
The article said that on the day of the time trial, to recruit a pacer is perhaps the most important thing. Better yet, recruit several. People believe that a 6 min mile is easy. But it is important not to get boxed in. Like they said, plan to go slightly fast on the lap, run a steady pace on the second, then maintain on the 3rd lap and 4th. Think smooth and relaxed, but fast.
I am not use to giving advice to anyone getting back in shape. In but in general my advice is realistic. Don't try a sub six unless a 80-quarter is possible. Try to build confidence with more minor steps you know you can achieve.
Finally, more is not always better. Train to maintain something you can live with.