K.I.S.S. (Keep It Simple Stupid) A motto well learned by many successful BB'ers over the years. It was also a banner placed on the wall of a old school style gym I had used before.
Agree with IroNat, full body and with a focus on compound exercises involving two joints or more. Two or three time a week. With a abbreviate workout program involving a few selected exercises with less sets, as 3 to 5 sets max each body part.
The general guide is to start with working the larger muscle groups at the beginning of a workout down to the smaller. Example: legs, back, chest delts & arms. If wishing to work the total ab wall with one movement, than would suggest a Ab Wheel at the end of a training session. Suggesting other Ab exercises can done in a 6-9 rep also, other than the mentioned Ab Wheel, and with extra weight added. The ab region is a very powerful short range muscle group.
As for reps...20 reps will do for you what 5 reps won't. And 5 reps will do for you what 20 reps won't. In other words each of us will have to explore a bit to find the rep range best suited for your goals and body types. In general BB'ing, the 6-9 rep span seems to work quite well for most. But again, you will have to use experience as your guide.
A simple program for you consideration: Squats, BB Row, Bench, Press Behind Neck, BB Curl. Three times a week. Three to five sets each. 6-9 reps range.
Would also suggest the tried and proven Progressive training system. The purpose is in trying to improve either the reps or poundage from workout to workout. Even adding as little as 5lbs to a bar or one more rep is the idea. It's the advancing of either reps or weight, progressing each training session.
All of the above are only suggestions. If not filling your personal needs, than by all means do what you believe is best suited for you.
Good Luck.