Hit each muscle group twice a week.
push pull off repeat, or push pull legs repeat-with 1 day a week off if you feel you need it.
2 of 4 exercises per muscle group each workout, 4-8 rep range or whatever rep range you have previously had most success with.
3 sets per exercise, give or take. Possibly less for isolation exercises that are already being hit with compounds, even if its 1 set.
Alternate excercises so you never do them twice in a row for ex:
Sun off or repeat
Example of exercise rotation for chest:
PushA: Decline BB Bench, Flat DB bench
PushB: Flat DB Flyes, Dips
I would also get re-accustomed to any exercises you haven't done in a while before hitting the PHs.