If I had known 30 years ago when I started training what I know now, I would have spent at least the first few months doing a Monday / Wednesday / Friday (or Tues / Thur / Sat) split where I divided my training up into 3 separate workouts - Back and bis on Mon; Chest, shoulders, and tris on Wed; and Legs on Friday with 2 days rest after.
I would limit time on the weights to less than an hour, and to do no more than 25-30 total sets in any one workout - you may find 12-15 total sets per workout sufficient to work up to at first. Rest longer between sets of squats, rows, deadlifts, pullups, presses, dips, etc than you do between exercises such as barbell curls and standing calf raises. And do fewer sets and exercises for smaller bodyparts than larger ones.