Welcome from a fellow member of the Class of 1962.
As for where to start a training log, I would suggest one of two places: Either in the 'Over 35' subforum, or the Training Logs subforum. Loggers in the O35 tend to be more powerlifting oriented, but a log of any sort would be welcomed there. Logs in the Training Log subforum run the gamut--powerlifters, BBers, physique athletes, conditioning logs, etc. Wherever you decide to park, I'm sure you'll encounter a lot of nice/supportive people.